diff --git a/benchmarks/results.Ikarus-Scheme-r6rs b/benchmarks/results.Ikarus-Scheme-r6rs
index ab1de40..8ad1c04 100644
--- a/benchmarks/results.Ikarus-Scheme-r6rs
+++ b/benchmarks/results.Ikarus-Scheme-r6rs
@@ -1,6 +1,6 @@
 
 ****************************
-Benchmarking Ikarus-Scheme-r6rs on Sat Jan 20 00:42:10 EST 2007 under Darwin adsl-75-19-180-26.dsl.bltnin.sbcglobal.net 8.8.3 Darwin Kernel Version 8.8.3: Wed Oct 18 21:57:10 PDT 2006; root:xnu-792.15.4.obj~4/RELEASE_I386 i386 i386
+Benchmarking Ikarus-Scheme-r6rs on Sat Jan 20 16:21:46 EST 2007 under Darwin 10-231-80-30.dhcp-bl.indiana.edu 8.8.3 Darwin Kernel Version 8.8.3: Wed Oct 18 21:57:10 PDT 2006; root:xnu-792.15.4.obj~4/RELEASE_I386 i386 i386
 
 Testing boyer under Ikarus-Scheme-r6rs
 Compiling...
@@ -11,9 +11,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     17 collections
-    1.001s user time
-    0.007s system time
-    1.009s real time
+    1.019s real    1.010s user    0.007s sys
     72832056 bytes allocated
 
 Testing browse under Ikarus-Scheme-r6rs
@@ -25,9 +23,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     151 collections
-    2.512s user time
-    0.030s system time
-    2.544s real time
+    2.551s real    2.519s user    0.031s sys
     633609656 bytes allocated
 
 Testing cpstak under Ikarus-Scheme-r6rs
@@ -39,9 +35,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     243 collections
-    2.584s user time
-    0.038s system time
-    2.623s real time
+    2.575s real    2.528s user    0.042s sys
     1017728056 bytes allocated
 
 Testing ctak under Ikarus-Scheme-r6rs
@@ -53,9 +47,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     127 collections
-    1.097s user time
-    0.212s system time
-    1.310s real time
+    1.329s real    1.109s user    0.219s sys
     534317320 bytes allocated
 
 Testing dderiv under Ikarus-Scheme-r6rs
@@ -67,9 +59,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     248 collections
-    1.440s user time
-    0.012s system time
-    1.453s real time
+    1.488s real    1.469s user    0.013s sys
     1040000056 bytes allocated
 
 Testing deriv under Ikarus-Scheme-r6rs
@@ -81,9 +71,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     187 collections
-    0.961s user time
-    0.012s system time
-    0.974s real time
+    0.991s real    0.979s user    0.012s sys
     784000056 bytes allocated
 
 Testing destruc under Ikarus-Scheme-r6rs
@@ -95,9 +83,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     61 collections
-    3.251s user time
-    0.015s system time
-    3.267s real time
+    3.282s real    3.258s user    0.017s sys
     257444056 bytes allocated
 
 Testing diviter under Ikarus-Scheme-r6rs
@@ -109,9 +95,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     191 collections
-    1.935s user time
-    0.011s system time
-    1.947s real time
+    1.948s real    1.935s user    0.012s sys
     800000056 bytes allocated
 
 Testing divrec under Ikarus-Scheme-r6rs
@@ -123,9 +107,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     191 collections
-    1.969s user time
-    0.017s system time
-    1.992s real time
+    1.975s real    1.962s user    0.012s sys
     800000056 bytes allocated
 
 Testing puzzle under Ikarus-Scheme-r6rs
@@ -137,9 +119,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     17 collections
-    4.314s user time
-    0.011s system time
-    4.330s real time
+    4.370s real    4.357s user    0.011s sys
     70742488 bytes allocated
 
 Testing takl under Ikarus-Scheme-r6rs
@@ -151,9 +131,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     no collections
-    1.515s user time
-    0.000s system time
-    1.520s real time
+    1.519s real    1.518s user    0.000s sys
     48 bytes allocated
 
 Testing triangl under Ikarus-Scheme-r6rs
@@ -165,9 +143,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     no collections
-    5.125s user time
-    0.002s system time
-    5.132s real time
+    5.333s real    5.332s user    0.001s sys
     930048 bytes allocated
 
 Testing fft under Ikarus-Scheme-r6rs
@@ -188,9 +164,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     no collections
-    6.944s user time
-    0.001s system time
-    6.946s real time
+    6.741s real    6.732s user    0.002s sys
     48 bytes allocated
 
 Testing fibfp under Ikarus-Scheme-r6rs
@@ -229,9 +203,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     no collections
-    4.625s user time
-    0.005s system time
-    4.633s real time
+    4.222s real    4.215s user    0.001s sys
     80048 bytes allocated
 
 Testing sumfp under Ikarus-Scheme-r6rs
@@ -252,9 +224,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     no collections
-    3.766s user time
-    0.001s system time
-    3.773s real time
+    3.696s real    3.694s user    0.000s sys
     48 bytes allocated
 
 Testing ack under Ikarus-Scheme-r6rs
@@ -266,9 +236,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     no collections
-    0.499s user time
-    0.000s system time
-    0.499s real time
+    0.522s real    0.522s user    0.000s sys
     48 bytes allocated
 
 Testing array1 under Ikarus-Scheme-r6rs
@@ -280,9 +248,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     40 collections
-    2.020s user time
-    0.035s system time
-    2.056s real time
+    2.071s real    2.035s user    0.035s sys
     160005672 bytes allocated
 
 Testing cat under Ikarus-Scheme-r6rs
@@ -294,9 +260,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     no collections
-    0.175s user time
-    0.039s system time
-    0.214s real time
+    0.211s real    0.174s user    0.036s sys
     34520 bytes allocated
 
 Testing string under Ikarus-Scheme-r6rs
@@ -308,9 +272,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     10 collections
-    0.292s user time
-    0.010s system time
-    0.303s real time
+    0.303s real    0.292s user    0.010s sys
     31464952 bytes allocated
 
 Testing sum1 under Ikarus-Scheme-r6rs
@@ -331,9 +293,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     no collections
-    5.242s user time
-    0.001s system time
-    5.244s real time
+    5.562s real    5.560s user    0.001s sys
     64 bytes allocated
 
 Testing tail under Ikarus-Scheme-r6rs
@@ -345,9 +305,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     18 collections
-    0.478s user time
-    0.082s system time
-    0.560s real time
+    0.578s real    0.499s user    0.078s sys
     77128368 bytes allocated
 
 Testing wc under Ikarus-Scheme-r6rs
@@ -359,9 +317,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     no collections
-    0.432s user time
-    0.005s system time
-    0.438s real time
+    0.341s real    0.335s user    0.005s sys
     12960 bytes allocated
 
 Testing conform under Ikarus-Scheme-r6rs
@@ -373,12 +329,8 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     38 collections
-    1.360s user time
-    0.015s system time
-    1.376s real time
+    1.387s real    1.371s user    0.015s sys
     162415416 bytes allocated
-Error in top-level-value: char-downcase is unbound.
-> 
 
 Testing dynamic under Ikarus-Scheme-r6rs
 Compiling...
@@ -389,9 +341,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     11 collections
-    0.508s user time
-    0.012s system time
-    0.520s real time
+    0.525s real    0.512s user    0.012s sys
     44168776 bytes allocated
 
 Testing earley under Ikarus-Scheme-r6rs
@@ -412,9 +362,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     79 collections
-    1.333s user time
-    0.136s system time
-    1.470s real time
+    1.440s real    1.301s user    0.138s sys
     334408904 bytes allocated
 
 Testing graphs under Ikarus-Scheme-r6rs
@@ -426,9 +374,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     189 collections
-    2.249s user time
-    0.045s system time
-    2.295s real time
+    2.294s real    2.248s user    0.045s sys
     790269656 bytes allocated
 
 Testing lattice under Ikarus-Scheme-r6rs
@@ -440,9 +386,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     91 collections
-    1.670s user time
-    0.023s system time
-    1.697s real time
+    1.633s real    1.609s user    0.023s sys
     381967088 bytes allocated
 
 Testing matrix under Ikarus-Scheme-r6rs
@@ -462,7 +406,7 @@ Ikarus Scheme (Build 2007-01-20)
 Copyright (c) 2006-2007 Abdulaziz Ghuloum
 
 > 
-Error in top-level-value: exact? is unbound.
+Error in top-level-value: modulo is unbound.
 > 
 
 Testing mazefun under Ikarus-Scheme-r6rs
@@ -484,9 +428,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     65 collections
-    3.472s user time
-    0.011s system time
-    3.484s real time
+    3.347s real    3.335s user    0.012s sys
     274320056 bytes allocated
 
 Testing paraffins under Ikarus-Scheme-r6rs
@@ -496,8 +438,10 @@ Ikarus Scheme (Build 2007-01-20)
 Copyright (c) 2006-2007 Abdulaziz Ghuloum
 
 > 
-Error in top-level-value: max is unbound.
-> 
+running stats for (run-bench name count ok? run):
+    198 collections
+    1.447s real    1.194s user    0.252s sys
+    831232056 bytes allocated
 
 Testing peval under Ikarus-Scheme-r6rs
 Compiling...
@@ -508,9 +452,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     36 collections
-    1.007s user time
-    0.013s system time
-    1.022s real time
+    1.028s real    1.016s user    0.012s sys
     151770008 bytes allocated
 
 Testing primes under Ikarus-Scheme-r6rs
@@ -538,7 +480,7 @@ Running...
 Ikarus Scheme (Build 2007-01-20)
 Copyright (c) 2006-2007 Abdulaziz Ghuloum
 
-> Error in top-level-value: complex? is unbound.
+> Error in top-level-value: / is unbound.
 > 
 
 Testing simplex under Ikarus-Scheme-r6rs
@@ -557,8 +499,10 @@ Ikarus Scheme (Build 2007-01-20)
 Copyright (c) 2006-2007 Abdulaziz Ghuloum
 
 > 
-Error in top-level-value: char-alphabetic? is unbound.
-> 
+running stats for (run-bench name count ok? run):
+    9 collections
+    2.424s real    0.504s user    0.991s sys
+    36086008 bytes allocated
 
 Testing perm9 under Ikarus-Scheme-r6rs
 Compiling...
@@ -569,9 +513,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     40 collections
-    2.363s user time
-    0.164s system time
-    2.528s real time
+    2.613s real    2.425s user    0.172s sys
     170498936 bytes allocated
 
 Testing nboyer under Ikarus-Scheme-r6rs
@@ -583,9 +525,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     49 collections
-    1.491s user time
-    0.008s system time
-    1.501s real time
+    1.530s real    1.513s user    0.010s sys
     203661656 bytes allocated
 
 Testing sboyer under Ikarus-Scheme-r6rs
@@ -597,9 +537,7 @@ Copyright (c) 2006-2007 Abdulaziz Ghuloum
 > 
 running stats for (run-bench name count ok? run):
     16 collections
-    1.528s user time
-    0.007s system time
-    1.536s real time
+    1.530s real    1.509s user    0.010s sys
     66159256 bytes allocated
 
 Testing gcbench under Ikarus-Scheme-r6rs
@@ -618,8 +556,10 @@ Ikarus Scheme (Build 2007-01-20)
 Copyright (c) 2006-2007 Abdulaziz Ghuloum
 
 > 
-Error in top-level-value: char-whitespace? is unbound.
-> 
+running stats for (run-bench name count ok? run):
+    41 collections
+    5.054s real    5.011s user    0.023s sys
+    171456072 bytes allocated
 
 Testing gcold under Ikarus-Scheme-r6rs
 Compiling...
diff --git a/benchmarks/results.Larceny-r6rs b/benchmarks/results.Larceny-r6rs
index bf3b7c2..25c5798 100644
--- a/benchmarks/results.Larceny-r6rs
+++ b/benchmarks/results.Larceny-r6rs
@@ -1,6 +1,6 @@
 
 ****************************
-Benchmarking Larceny-r6rs on Sat Jan 20 00:46:42 EST 2007 under Darwin adsl-75-19-180-26.dsl.bltnin.sbcglobal.net 8.8.3 Darwin Kernel Version 8.8.3: Wed Oct 18 21:57:10 PDT 2006; root:xnu-792.15.4.obj~4/RELEASE_I386 i386 i386
+Benchmarking Larceny-r6rs on Sat Jan 20 16:26:37 EST 2007 under Darwin 10-231-80-30.dhcp-bl.indiana.edu 8.8.3 Darwin Kernel Version 8.8.3: Wed Oct 18 21:57:10 PDT 2006; root:xnu-792.15.4.obj~4/RELEASE_I386 i386 i386
 
 Testing boyer under Larceny-r6rs
 Compiling...
@@ -17,7 +17,7 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 Words allocated: 9174986
 Words reclaimed: 0
 Elapsed time...: 604 ms (User: 589 ms; System: 15 ms)
-Elapsed GC time: 84 ms (CPU: 81 in 35 collections.)
+Elapsed GC time: 81 ms (CPU: 82 in 35 collections.)
 
 Testing browse under Larceny-r6rs
 Compiling...
@@ -34,7 +34,7 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 Words allocated: 120585534
 Words reclaimed: 0
 Elapsed time...: 2857 ms (User: 2848 ms; System: 8 ms)
-Elapsed GC time: 176 ms (CPU: 172 in 460 collections.)
+Elapsed GC time: 166 ms (CPU: 169 in 460 collections.)
 
 Testing cpstak under Larceny-r6rs
 Compiling...
@@ -50,8 +50,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 318239878
 Words reclaimed: 0
-Elapsed time...: 1479 ms (User: 1473 ms; System: 6 ms)
-Elapsed GC time: 440 ms (CPU: 440 in 1214 collections.)
+Elapsed time...: 1478 ms (User: 1472 ms; System: 6 ms)
+Elapsed GC time: 436 ms (CPU: 438 in 1214 collections.)
 
 Testing ctak under Larceny-r6rs
 Compiling...
@@ -67,8 +67,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 265286660
 Words reclaimed: 0
-Elapsed time...: 4785 ms (User: 4756 ms; System: 9 ms)
-Elapsed GC time: 383 ms (CPU: 379 in 1012 collections.)
+Elapsed time...: 4772 ms (User: 4756 ms; System: 9 ms)
+Elapsed GC time: 378 ms (CPU: 374 in 1012 collections.)
 
 Testing dderiv under Larceny-r6rs
 Compiling...
@@ -84,8 +84,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 244055776
 Words reclaimed: 0
-Elapsed time...: 1892 ms (User: 1881 ms; System: 10 ms)
-Elapsed GC time: 328 ms (CPU: 332 in 931 collections.)
+Elapsed time...: 1891 ms (User: 1882 ms; System: 9 ms)
+Elapsed GC time: 306 ms (CPU: 301 in 931 collections.)
 
 Testing deriv under Larceny-r6rs
 Compiling...
@@ -101,8 +101,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 244055778
 Words reclaimed: 0
-Elapsed time...: 1476 ms (User: 1464 ms; System: 11 ms)
-Elapsed GC time: 336 ms (CPU: 335 in 931 collections.)
+Elapsed time...: 1473 ms (User: 1463 ms; System: 9 ms)
+Elapsed GC time: 336 ms (CPU: 333 in 931 collections.)
 
 Testing destruc under Larceny-r6rs
 Compiling...
@@ -118,8 +118,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 43253750
 Words reclaimed: 0
-Elapsed time...: 1039 ms (User: 1034 ms; System: 3 ms)
-Elapsed GC time: 67 ms (CPU: 67 in 165 collections.)
+Elapsed time...: 1042 ms (User: 1034 ms; System: 4 ms)
+Elapsed GC time: 69 ms (CPU: 62 in 165 collections.)
 
 Testing diviter under Larceny-r6rs
 Compiling...
@@ -135,8 +135,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 200015872
 Words reclaimed: 0
-Elapsed time...: 1156 ms (User: 1150 ms; System: 6 ms)
-Elapsed GC time: 281 ms (CPU: 277 in 763 collections.)
+Elapsed time...: 1158 ms (User: 1151 ms; System: 7 ms)
+Elapsed GC time: 270 ms (CPU: 272 in 763 collections.)
 
 Testing divrec under Larceny-r6rs
 Compiling...
@@ -152,8 +152,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 200537100
 Words reclaimed: 0
-Elapsed time...: 1515 ms (User: 1414 ms; System: 101 ms)
-Elapsed GC time: 289 ms (CPU: 286 in 765 collections.)
+Elapsed time...: 1516 ms (User: 1414 ms; System: 101 ms)
+Elapsed GC time: 289 ms (CPU: 287 in 765 collections.)
 
 Testing puzzle under Larceny-r6rs
 Compiling...
@@ -169,8 +169,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 8126378
 Words reclaimed: 0
-Elapsed time...: 1949 ms (User: 1806 ms; System: 144 ms)
-Elapsed GC time: 14 ms (CPU: 14 in 31 collections.)
+Elapsed time...: 1948 ms (User: 1804 ms; System: 143 ms)
+Elapsed GC time: 12 ms (CPU: 13 in 31 collections.)
 
 Testing takl under Larceny-r6rs
 Compiling...
@@ -186,7 +186,7 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 0
 Words reclaimed: 0
-Elapsed time...: 908 ms (User: 907 ms; System: 0 ms)
+Elapsed time...: 908 ms (User: 907 ms; System: 1 ms)
 Elapsed GC time: 0 ms (CPU: 0 in 0 collections.)
 
 Testing triangl under Larceny-r6rs
@@ -203,7 +203,7 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 262144
 Words reclaimed: 0
-Elapsed time...: 2103 ms (User: 2100 ms; System: 1 ms)
+Elapsed time...: 2102 ms (User: 2101 ms; System: 2 ms)
 Elapsed GC time: 1 ms (CPU: 1 in 1 collections.)
 
 Testing fft under Larceny-r6rs
@@ -220,8 +220,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 217579520
 Words reclaimed: 0
-Elapsed time...: 1651 ms (User: 1622 ms; System: 29 ms)
-Elapsed GC time: 536 ms (CPU: 429 in 830 collections.)
+Elapsed time...: 1650 ms (User: 1621 ms; System: 29 ms)
+Elapsed GC time: 470 ms (CPU: 533 in 830 collections.)
 
 Testing fib under Larceny-r6rs
 Compiling...
@@ -237,7 +237,7 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 0
 Words reclaimed: 0
-Elapsed time...: 1804 ms (User: 1802 ms; System: 1 ms)
+Elapsed time...: 1788 ms (User: 1786 ms; System: 1 ms)
 Elapsed GC time: 0 ms (CPU: 0 in 0 collections.)
 
 Testing fibfp under Larceny-r6rs
@@ -254,8 +254,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 358610902
 Words reclaimed: 0
-Elapsed time...: 3192 ms (User: 3145 ms; System: 38 ms)
-Elapsed GC time: 498 ms (CPU: 489 in 1368 collections.)
+Elapsed time...: 3190 ms (User: 3145 ms; System: 39 ms)
+Elapsed GC time: 500 ms (CPU: 493 in 1368 collections.)
 
 Testing mbrot under Larceny-r6rs
 Compiling...
@@ -271,8 +271,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 551809449
 Words reclaimed: 0
-Elapsed time...: 2238 ms (User: 2223 ms; System: 14 ms)
-Elapsed GC time: 755 ms (CPU: 771 in 2105 collections.)
+Elapsed time...: 2241 ms (User: 2223 ms; System: 14 ms)
+Elapsed GC time: 756 ms (CPU: 770 in 2105 collections.)
 
 Testing pnpoly under Larceny-r6rs
 Compiling...
@@ -288,8 +288,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 72351712
 Words reclaimed: 0
-Elapsed time...: 1463 ms (User: 1450 ms; System: 5 ms)
-Elapsed GC time: 100 ms (CPU: 103 in 276 collections.)
+Elapsed time...: 1450 ms (User: 1448 ms; System: 3 ms)
+Elapsed GC time: 102 ms (CPU: 101 in 276 collections.)
 
 Testing sum under Larceny-r6rs
 Compiling...
@@ -305,7 +305,7 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 0
 Words reclaimed: 0
-Elapsed time...: 554 ms (User: 553 ms; System: 1 ms)
+Elapsed time...: 553 ms (User: 553 ms; System: 0 ms)
 Elapsed GC time: 0 ms (CPU: 0 in 0 collections.)
 
 Testing sumfp under Larceny-r6rs
@@ -322,8 +322,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 400031744
 Words reclaimed: 0
-Elapsed time...: 1805 ms (User: 1799 ms; System: 6 ms)
-Elapsed GC time: 539 ms (CPU: 538 in 1526 collections.)
+Elapsed time...: 1805 ms (User: 1798 ms; System: 6 ms)
+Elapsed GC time: 548 ms (CPU: 544 in 1526 collections.)
 
 Testing tak under Larceny-r6rs
 Compiling...
@@ -339,7 +339,7 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 0
 Words reclaimed: 0
-Elapsed time...: 1207 ms (User: 1202 ms; System: 1 ms)
+Elapsed time...: 1201 ms (User: 1201 ms; System: 0 ms)
 Elapsed GC time: 0 ms (CPU: 0 in 0 collections.)
 
 Testing ack under Larceny-r6rs
@@ -356,7 +356,7 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 0
 Words reclaimed: 0
-Elapsed time...: 85 ms (User: 84 ms; System: 0 ms)
+Elapsed time...: 84 ms (User: 84 ms; System: 0 ms)
 Elapsed GC time: 0 ms (CPU: 0 in 0 collections.)
 
 Testing array1 under Larceny-r6rs
@@ -373,8 +373,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 39870054
 Words reclaimed: 0
-Elapsed time...: 517 ms (User: 437 ms; System: 80 ms)
-Elapsed GC time: 45 ms (CPU: 48 in 100 collections.)
+Elapsed time...: 511 ms (User: 434 ms; System: 76 ms)
+Elapsed GC time: 47 ms (CPU: 45 in 100 collections.)
 
 Testing cat under Larceny-r6rs
 Compiling...
@@ -390,7 +390,7 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 0
 Words reclaimed: 0
-Elapsed time...: 499 ms (User: 373 ms; System: 126 ms)
+Elapsed time...: 496 ms (User: 372 ms; System: 124 ms)
 Elapsed GC time: 0 ms (CPU: 0 in 0 collections.)
 
 Testing string under Larceny-r6rs
@@ -407,8 +407,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 7834358
 Words reclaimed: 0
-Elapsed time...: 417 ms (User: 396 ms; System: 21 ms)
-Elapsed GC time: 41 ms (CPU: 37 in 30 collections.)
+Elapsed time...: 425 ms (User: 397 ms; System: 23 ms)
+Elapsed GC time: 40 ms (CPU: 39 in 30 collections.)
 
 Testing sum1 under Larceny-r6rs
 Compiling...
@@ -424,8 +424,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 6553374
 Words reclaimed: 0
-Elapsed time...: 3490 ms (User: 2051 ms; System: 1438 ms)
-Elapsed GC time: 8 ms (CPU: 11 in 25 collections.)
+Elapsed time...: 3490 ms (User: 2055 ms; System: 1421 ms)
+Elapsed GC time: 8 ms (CPU: 10 in 25 collections.)
 
 Testing sumloop under Larceny-r6rs
 Compiling...
@@ -458,8 +458,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 19136354
 Words reclaimed: 0
-Elapsed time...: 703 ms (User: 573 ms; System: 130 ms)
-Elapsed GC time: 46 ms (CPU: 44 in 73 collections.)
+Elapsed time...: 700 ms (User: 573 ms; System: 127 ms)
+Elapsed GC time: 45 ms (CPU: 41 in 73 collections.)
 
 Testing wc under Larceny-r6rs
 Compiling...
@@ -475,7 +475,7 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 0
 Words reclaimed: 0
-Elapsed time...: 293 ms (User: 249 ms; System: 44 ms)
+Elapsed time...: 293 ms (User: 248 ms; System: 44 ms)
 Elapsed GC time: 0 ms (CPU: 0 in 0 collections.)
 
 Testing conform under Larceny-r6rs
@@ -492,8 +492,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 22544148
 Words reclaimed: 0
-Elapsed time...: 1441 ms (User: 1432 ms; System: 9 ms)
-Elapsed GC time: 65 ms (CPU: 71 in 86 collections.)
+Elapsed time...: 1442 ms (User: 1433 ms; System: 9 ms)
+Elapsed GC time: 76 ms (CPU: 74 in 86 collections.)
 
 Testing dynamic under Larceny-r6rs
 Compiling...
@@ -509,8 +509,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 14942078
 Words reclaimed: 0
-Elapsed time...: 773 ms (User: 711 ms; System: 61 ms)
-Elapsed GC time: 193 ms (CPU: 195 in 57 collections.)
+Elapsed time...: 773 ms (User: 712 ms; System: 62 ms)
+Elapsed GC time: 188 ms (CPU: 188 in 57 collections.)
 
 Testing earley under Larceny-r6rs
 Compiling...
@@ -526,8 +526,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 123206268
 Words reclaimed: 0
-Elapsed time...: 2025 ms (User: 1934 ms; System: 91 ms)
-Elapsed GC time: 582 ms (CPU: 579 in 470 collections.)
+Elapsed time...: 2021 ms (User: 1933 ms; System: 89 ms)
+Elapsed GC time: 573 ms (CPU: 575 in 470 collections.)
 
 Testing fibc under Larceny-r6rs
 Compiling...
@@ -543,8 +543,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 192411392
 Words reclaimed: 0
-Elapsed time...: 4123 ms (User: 4114 ms; System: 8 ms)
-Elapsed GC time: 270 ms (CPU: 276 in 734 collections.)
+Elapsed time...: 4121 ms (User: 4114 ms; System: 8 ms)
+Elapsed GC time: 275 ms (CPU: 276 in 734 collections.)
 
 Testing graphs under Larceny-r6rs
 Compiling...
@@ -560,8 +560,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 157021446
 Words reclaimed: 0
-Elapsed time...: 1658 ms (User: 1627 ms; System: 22 ms)
-Elapsed GC time: 267 ms (CPU: 273 in 599 collections.)
+Elapsed time...: 1647 ms (User: 1625 ms; System: 21 ms)
+Elapsed GC time: 262 ms (CPU: 271 in 599 collections.)
 
 Testing lattice under Larceny-r6rs
 Compiling...
@@ -577,8 +577,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 19398398
 Words reclaimed: 0
-Elapsed time...: 1681 ms (User: 1677 ms; System: 4 ms)
-Elapsed GC time: 32 ms (CPU: 27 in 74 collections.)
+Elapsed time...: 1678 ms (User: 1674 ms; System: 3 ms)
+Elapsed GC time: 27 ms (CPU: 26 in 74 collections.)
 
 Testing matrix under Larceny-r6rs
 Compiling...
@@ -594,8 +594,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 87555006
 Words reclaimed: 0
-Elapsed time...: 1862 ms (User: 1849 ms; System: 12 ms)
-Elapsed GC time: 126 ms (CPU: 122 in 334 collections.)
+Elapsed time...: 1860 ms (User: 1849 ms; System: 9 ms)
+Elapsed GC time: 130 ms (CPU: 136 in 334 collections.)
 
 Testing maze under Larceny-r6rs
 Compiling...
@@ -611,8 +611,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 36170288
 Words reclaimed: 0
-Elapsed time...: 5834 ms (User: 5798 ms; System: 29 ms)
-Elapsed GC time: 88 ms (CPU: 79 in 138 collections.)
+Elapsed time...: 5846 ms (User: 5801 ms; System: 31 ms)
+Elapsed GC time: 85 ms (CPU: 79 in 138 collections.)
 
 Testing mazefun under Larceny-r6rs
 Compiling...
@@ -628,8 +628,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 47447672
 Words reclaimed: 0
-Elapsed time...: 1293 ms (User: 1285 ms; System: 8 ms)
-Elapsed GC time: 75 ms (CPU: 72 in 181 collections.)
+Elapsed time...: 1294 ms (User: 1285 ms; System: 8 ms)
+Elapsed GC time: 71 ms (CPU: 71 in 181 collections.)
 
 Testing nqueens under Larceny-r6rs
 Compiling...
@@ -645,8 +645,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 71302772
 Words reclaimed: 0
-Elapsed time...: 1594 ms (User: 1583 ms; System: 11 ms)
-Elapsed GC time: 99 ms (CPU: 105 in 272 collections.)
+Elapsed time...: 1612 ms (User: 1587 ms; System: 13 ms)
+Elapsed GC time: 112 ms (CPU: 101 in 272 collections.)
 
 Testing paraffins under Larceny-r6rs
 Compiling...
@@ -662,8 +662,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 201324942
 Words reclaimed: 0
-Elapsed time...: 4293 ms (User: 3757 ms; System: 534 ms)
-Elapsed GC time: 2462 ms (CPU: 2465 in 768 collections.)
+Elapsed time...: 4312 ms (User: 3766 ms; System: 528 ms)
+Elapsed GC time: 2457 ms (CPU: 2460 in 768 collections.)
 
 Testing peval under Larceny-r6rs
 Compiling...
@@ -679,8 +679,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 34340444
 Words reclaimed: 0
-Elapsed time...: 1256 ms (User: 1248 ms; System: 6 ms)
-Elapsed GC time: 62 ms (CPU: 59 in 131 collections.)
+Elapsed time...: 1268 ms (User: 1255 ms; System: 8 ms)
+Elapsed GC time: 57 ms (CPU: 65 in 131 collections.)
 
 Testing primes under Larceny-r6rs
 Compiling...
@@ -696,8 +696,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 92273280
 Words reclaimed: 0
-Elapsed time...: 7606 ms (User: 7568 ms; System: 33 ms)
-Elapsed GC time: 127 ms (CPU: 123 in 352 collections.)
+Elapsed time...: 7656 ms (User: 7573 ms; System: 39 ms)
+Elapsed GC time: 134 ms (CPU: 130 in 352 collections.)
 
 Testing ray under Larceny-r6rs
 Compiling...
@@ -713,8 +713,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 218093224
 Words reclaimed: 0
-Elapsed time...: 23048 ms (User: 13115 ms; System: 9906 ms)
-Elapsed GC time: 317 ms (CPU: 301 in 832 collections.)
+Elapsed time...: 23522 ms (User: 13167 ms; System: 9989 ms)
+Elapsed GC time: 290 ms (CPU: 291 in 832 collections.)
 
 Testing scheme under Larceny-r6rs
 Compiling...
@@ -730,8 +730,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 29621860
 Words reclaimed: 0
-Elapsed time...: 1194 ms (User: 1190 ms; System: 3 ms)
-Elapsed GC time: 41 ms (CPU: 45 in 113 collections.)
+Elapsed time...: 1202 ms (User: 1192 ms; System: 5 ms)
+Elapsed GC time: 46 ms (CPU: 43 in 113 collections.)
 
 Testing simplex under Larceny-r6rs
 Compiling...
@@ -747,8 +747,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 126088192
 Words reclaimed: 0
-Elapsed time...: 42463 ms (User: 22981 ms; System: 19433 ms)
-Elapsed GC time: 191 ms (CPU: 224 in 481 collections.)
+Elapsed time...: 42660 ms (User: 22959 ms; System: 19546 ms)
+Elapsed GC time: 175 ms (CPU: 171 in 481 collections.)
 
 Testing slatex under Larceny-r6rs
 Compiling...
@@ -764,8 +764,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 4194150
 Words reclaimed: 0
-Elapsed time...: 1883 ms (User: 550 ms; System: 825 ms)
-Elapsed GC time: 12 ms (CPU: 13 in 16 collections.)
+Elapsed time...: 2096 ms (User: 553 ms; System: 775 ms)
+Elapsed GC time: 12 ms (CPU: 14 in 16 collections.)
 
 Testing perm9 under Larceny-r6rs
 Compiling...
@@ -781,8 +781,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 27000532
 Words reclaimed: 0
-Elapsed time...: 1552 ms (User: 1333 ms; System: 217 ms)
-Elapsed GC time: 1028 ms (CPU: 1027 in 103 collections.)
+Elapsed time...: 1550 ms (User: 1335 ms; System: 213 ms)
+Elapsed GC time: 1010 ms (CPU: 1022 in 103 collections.)
 
 Testing nboyer under Larceny-r6rs
 Compiling...
@@ -798,8 +798,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 50855620
 Words reclaimed: 0
-Elapsed time...: 1686 ms (User: 1603 ms; System: 82 ms)
-Elapsed GC time: 413 ms (CPU: 425 in 194 collections.)
+Elapsed time...: 1687 ms (User: 1603 ms; System: 81 ms)
+Elapsed GC time: 433 ms (CPU: 426 in 194 collections.)
 
 Testing sboyer under Larceny-r6rs
 Compiling...
@@ -815,8 +815,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 16514958
 Words reclaimed: 0
-Elapsed time...: 1321 ms (User: 1310 ms; System: 8 ms)
-Elapsed GC time: 45 ms (CPU: 46 in 63 collections.)
+Elapsed time...: 1324 ms (User: 1310 ms; System: 9 ms)
+Elapsed GC time: 43 ms (CPU: 43 in 63 collections.)
 
 Testing gcbench under Larceny-r6rs
 Compiling...
@@ -863,8 +863,8 @@ GCBench: Bottom up construction
  Total memory available= ???????? bytes  Free memory= ???????? bytes
 Words allocated: 94867544
 Words reclaimed: 0
-Elapsed time...: 1855 ms (User: 1589 ms; System: 260 ms)
-Elapsed GC time: 1144 ms (CPU: 1151 in 360 collections.)
+Elapsed time...: 1844 ms (User: 1587 ms; System: 253 ms)
+Elapsed GC time: 1137 ms (CPU: 1124 in 360 collections.)
 
 Testing parsing under Larceny-r6rs
 Compiling...
@@ -880,8 +880,8 @@ Larceny v0.93 "Deviated Prevert" (Nov 10 2006 04:27:45, precise:BSD Unix:unified
 > 
 Words allocated: 100923902
 Words reclaimed: 0
-Elapsed time...: 6581 ms (User: 6507 ms; System: 70 ms)
-Elapsed GC time: 289 ms (CPU: 280 in 385 collections.)
+Elapsed time...: 6582 ms (User: 6506 ms; System: 70 ms)
+Elapsed GC time: 289 ms (CPU: 281 in 385 collections.)
 
 Testing gcold under Larceny-r6rs
 Compiling...
@@ -906,5 +906,5 @@ Initialization complete...
 
 Words allocated: 2754230651
 Words reclaimed: 0
-Elapsed time...: 24962 ms (User: 20787 ms; System: 4153 ms)
-Elapsed GC time: 13536 ms (CPU: 13544 in 10508 collections.)
+Elapsed time...: 24878 ms (User: 20763 ms; System: 4107 ms)
+Elapsed GC time: 13446 ms (CPU: 13424 in 10508 collections.)
diff --git a/benchmarks/summarize b/benchmarks/summarize
index 9c44722..3fc7133 100755
--- a/benchmarks/summarize
+++ b/benchmarks/summarize
@@ -95,11 +95,12 @@ runtime == 1 && /^[ ]*([0-9.]+) real [ ]*([0-9.]+) user [ ]*([0-9.]+) sys$/ {
   real = $1 * 1000;
 }
 
-runtime == 1 && /[ ]*([0-9.]+)s user [ ]*([0-9.]+)s system [ ]*([0-9.]+)s real/ {
-  cpu = ($1 + $3) * 1000;
-  real = $5 * 1000;
+runtime == 1 && /[ ]*([0-9.]+)s real [ ]*([0-9.]+)s user [ ]*([0-9.]+)s sys/ {
+  real = $1 * 1000;
+  cpu = ($3 + $5) * 1000;
 }
 
+
 runtime == 1 && /^Elapsed time\.\.\.: ([0-9]+) ms/{
   real = $3;
 }
diff --git a/bin/ikarus b/bin/ikarus
index 0e6abae..b07b1fd 100755
Binary files a/bin/ikarus and b/bin/ikarus differ
diff --git a/bin/ikarus-runtime.c b/bin/ikarus-runtime.c
index 7fb50d8..cf0a429 100644
--- a/bin/ikarus-runtime.c
+++ b/bin/ikarus-runtime.c
@@ -821,7 +821,7 @@ ikrt_open_output_file(ikp fname, ikp flagptr, ikpcb* pcb){
     unlink(string_data(fname));
     flags = O_WRONLY | O_CREAT;
   } else if(f == 2){
-    flags = O_WRONLY | O_TRUNC;
+    flags = O_WRONLY | O_TRUNC | O_CREAT;
   } else if(f == 3){
     flags = O_WRONLY | O_APPEND;
   } else {
diff --git a/src/ikarus.boot b/src/ikarus.boot
index 4598eb6..7109030 100644
Binary files a/src/ikarus.boot and b/src/ikarus.boot differ
diff --git a/src/libcore.ss b/src/libcore.ss
index 2cd97cc..c1e75c1 100644
--- a/src/libcore.ss
+++ b/src/libcore.ss
@@ -704,6 +704,34 @@ reference-implementation:
       [else
        (error 'char-whitespace? "~s is not a character" c)])))
 
+(primitive-set! 'char-alphabetic?
+  (lambda (c)
+    (cond
+      [(char? c)
+       (cond
+         [($char<= #\a c) ($char<= c #\z)]
+         [($char<= #\A c) ($char<= c #\Z)]
+         [else #f])]
+      [else 
+       (error 'char-alphabetic?  "~s is not a character" c)])))
+
+(primitive-set! 'char-downcase
+  (lambda (c)
+    (cond
+      [(char? c)
+       (cond
+         [(and ($char<= #\A c) ($char<= c #\Z))
+          ($fixnum->char 
+            ($fx+ ($char->fixnum c)
+                  ($fx- ($char->fixnum #\a)
+                        ($char->fixnum #\A))))]
+         [else c])]
+      [else 
+       (error 'char-downcase "~s is not a character" c)])))
+
+
+
+
 (primitive-set! 'cons (lambda (x y) (cons x y)))
 
 (primitive-set! 'eq? (lambda (x y) (eq? x y)))
@@ -1704,3 +1732,48 @@ reference-implementation:
           x
           (error 'command-list "invalid command-line-arguments ~s\n" x)))))
 
+(primitive-set! 'string->number
+  (lambda (x)
+    (define (convert-data str len pos? idx ac)
+      (cond
+        [($fx= idx len) (if pos? ac (- 0 ac))]
+        [else
+         (let ([c ($string-ref str idx)])
+           (cond
+             [(and ($char<= #\0 c) ($char<= c #\9))
+              (convert-data str len pos? ($fxadd1 idx) 
+                 (+ (* ac 10)
+                    ($fx- ($char->fixnum c) ($char->fixnum #\0))))]
+             [else #f]))]))
+    (define (convert-data-init str len pos? idx c)
+      (cond
+        [($char= c #\0) 
+         (if ($fx= idx len)
+             0
+             (convert-data-init str len pos? 
+                ($fxadd1 idx) 
+                ($string-ref str idx)))]
+        [(and ($char<= #\1 c) ($char<= c #\9))
+         (convert-data str len pos? idx
+            ($fx- ($char->fixnum c) ($char->fixnum #\0)))]
+        [else #f]))
+    (define (convert-num str len pos?)
+      (cond
+        [($fx> len 1)
+         (convert-data-init str len pos? 2 ($string-ref str 1))]
+        [else #f]))
+    (define (convert-sign str len)
+      (cond
+        [($fx> len 0)
+         (let ([c ($string-ref str 0)])
+           (case c
+             [(#\+) (convert-num str len #t)]
+             [(#\-) (convert-num str len #f)]
+             [else
+              (convert-data-init str len #t 1 c)]))]
+        [else #f]))
+    (cond
+      [(string? x) 
+       (convert-sign x ($string-length x))]
+      [else (error 'string->number "~s is not a string" x)])))
+
diff --git a/src/libnumerics.ss b/src/libnumerics.ss
index 67d9520..6299fcc 100644
--- a/src/libnumerics.ss
+++ b/src/libnumerics.ss
@@ -163,12 +163,90 @@
         [else
          (binary* n (expt (binary* n n) (#%$fxsra m 1)))])))
 
+  (define max
+    (case-lambda
+      [(x y)
+       (cond
+         [(fixnum? x) 
+          (cond
+            [(fixnum? y) 
+             (if ($fx> x y) x y)]
+            [(bignum? y)
+             (if (positive-bignum? y) y x)]
+            [else (error 'max "~s is not a number" y)])]
+         [(bignum? x)
+          (cond
+            [(fixnum? y)
+             (if (positive-bignum? x) x y)]
+            [(bignum? y)
+             (if (bnbn> x y) x y)]
+            [else (error 'max "~s is not a number" y)])]
+         [else (error 'max "~s is not a number" x)])]
+      [(x y z . rest)
+       (let f ([a (max x y)] [b z] [ls rest])
+         (cond
+           [(null? ls) (max a b)]
+           [else
+            (f (max a b) (car ls) (cdr ls))]))]
+      [(x) 
+       (if (number? x) 
+           x 
+           (error 'max "~s is not a number" x))]))
+
+(define min
+    (case-lambda
+      [(x y)
+       (cond
+         [(fixnum? x) 
+          (cond
+            [(fixnum? y) 
+             (if ($fx> x y) y x)]
+            [(bignum? y)
+             (if (positive-bignum? y) x y)]
+            [else (error 'min "~s is not a number" y)])]
+         [(bignum? x)
+          (cond
+            [(fixnum? y)
+             (if (positive-bignum? x) y x)]
+            [(bignum? y)
+             (if (bnbn> x y) y x)]
+            [else (error 'min "~s is not a number" y)])]
+         [else (error 'min "~s is not a number" x)])]
+      [(x y z . rest)
+       (let f ([a (min x y)] [b z] [ls rest])
+         (cond
+           [(null? ls) (min a b)]
+           [else
+            (f (min a b) (car ls) (cdr ls))]))]
+      [(x) 
+       (if (number? x) 
+           x 
+           (error 'min "~s is not a number" x))]))
 
   (define number?
     (lambda (x)
       (or (fixnum? x)
           (bignum? x))))
 
+  (define complex?
+    (lambda (x) (number? x)))
+  (define real?
+    (lambda (x) (number? x)))
+  (define rational?
+    (lambda (x) (number? x)))
+  (define integer?
+    (lambda (x) (number? x)))
+  (define exact?
+    (lambda (x) 
+      (or (number? x)
+          (error 'exact? "~s is not a number" x))))
+
+  (define inexact?
+    (lambda (x) 
+      (if (number? x)
+          #f
+          (error 'inexact? "~s is not a number" x))))
+
   (define positive-bignum?
     (lambda (x) 
       (foreign-call "ikrt_positive_bn" x)))
@@ -315,6 +393,7 @@
 
 
 
+
   (primitive-set! '+ +)
   (primitive-set! '- -)
   (primitive-set! '* *)
@@ -430,4 +509,12 @@
 
   (primitive-set! 'even? even?)
   (primitive-set! 'odd? odd?)
+  (primitive-set! 'max max)
+  (primitive-set! 'min min)
+  (primitive-set! 'complex? complex?)
+  (primitive-set! 'real? real?)
+  (primitive-set! 'rational? rational?)
+  (primitive-set! 'exact? exact?)
+  (primitive-set! 'inexact? inexact?)
+  (primitive-set! 'integer? integer?)
   )
diff --git a/src/libtimers.ss b/src/libtimers.ss
index 2bcda8d..4a69417 100644
--- a/src/libtimers.ss
+++ b/src/libtimers.ss
@@ -14,7 +14,7 @@
     (define (print-time msg secs usecs)
       (if (fx< usecs 0)
           (print-time msg (fx- secs 1) (fx+ usecs 1000000))
-          (printf "    ~a.~a~a~as ~a time\n"
+          (printf "    ~a.~a~a~as ~a"
                   secs
                   (fxremainder (fxquotient usecs 100000) 10)
                   (fxremainder (fxquotient usecs 10000) 10)
@@ -30,15 +30,15 @@
         [(1) (display "    1 collection\n")]
         [else (printf "    ~a collections\n" collections)]))
 
-    (print-time "user" 
-        (fx- (stats-user-secs t1) (stats-user-secs t0))
-        (fx- (stats-user-usecs t1) (stats-user-usecs t0)))
-    (print-time "system" 
-        (fx- (stats-sys-secs t1) (stats-sys-secs t0))
-        (fx- (stats-sys-usecs t1) (stats-sys-usecs t0)))
     (print-time "real" 
         (fx- (stats-real-secs t1) (stats-real-secs t0))
         (fx- (stats-real-usecs t1) (stats-real-usecs t0)))
+    (print-time "user" 
+        (fx- (stats-user-secs t1) (stats-user-secs t0))
+        (fx- (stats-user-usecs t1) (stats-user-usecs t0)))
+    (print-time "sys\n" 
+        (fx- (stats-sys-secs t1) (stats-sys-secs t0))
+        (fx- (stats-sys-usecs t1) (stats-sys-usecs t0)))
     (printf "    ~a bytes allocated\n" bytes))
 
   (define time-it
diff --git a/src/libwriter.ss b/src/libwriter.ss
index 31d7530..3a1a59b 100644
--- a/src/libwriter.ss
+++ b/src/libwriter.ss
@@ -24,7 +24,8 @@
               (write-char #\\ p)
               (write-char* "del" p)]
              [else
-              (write-char #\+ p)
+              (write-char #\\ p)
+              (write-char #\x p)
               (write-fixnum i p)]))
           (write-char x p))))
   (define write-list
diff --git a/src/makefile.ss b/src/makefile.ss
index ab15c70..a01af5d 100755
--- a/src/makefile.ss
+++ b/src/makefile.ss
@@ -88,7 +88,10 @@
     time-it 
     posix-fork fork waitpid env environ
     pretty-print
-    even? odd? member char-whitespace?
+    even? odd? member char-whitespace? char-alphabetic?
+    char-downcase max min complex? real? rational? 
+    exact? inexact? integer?
+    string->number
     ))
 
 (define system-primitives