Percise rounding parsing octal and hexadecimal strings....

test/mjsunit/number-tostring.js

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 104 matching lines @@
 assertEquals("5yc1z", (10000007).toString(36));
 assertEquals("0", (0).toString(36));
 assertEquals("0", (0).toString(16));
 assertEquals("0", (0).toString(10));
 assertEquals("0", (0).toString(8));
 assertEquals("0", (0).toString(2));
 assertEquals("100000000000000000000000000000000", Math.pow(2,32).toString(2));
 assertEquals("100000000000000000000000000000001", (Math.pow(2,32) + 1).toString(2));
 assertEquals("100000000000080", (0x100000000000081).toString(16));
 assertEquals("1000000000000100", (-(-'0x1000000000000081')).toString(16));
+assertEquals("1000000000000000", (-(-'0x1000000000000080')).toString(16));
+assertEquals("1000000000000000", (-(-'0x100000000000007F')).toString(16));
 assertEquals("100000000000000000000000000000000000000000000000010000000", (0x100000000000081).toString(2));
 assertEquals("-11111111111111111111111111111111", (-(Math.pow(2,32)-1)).toString(2));
 assertEquals("-5yc1z", (-10000007).toString(36));
 assertEquals("-100000000000000000000000000000000", (-Math.pow(2,32)).toString(2));
 assertEquals("-100000000000000000000000000000001", (-(Math.pow(2,32) + 1)).toString(2));
 assertEquals("-100000000000080", (-0x100000000000081).toString(16));
 assertEquals("-100000000000000000000000000000000000000000000000010000000", (-0x100000000000081).toString(2));
 assertEquals("1000", (1000).toString());
 assertEquals("0.00001", (0.00001).toString());
 assertEquals("1000000000000000100", (1000000000000000128).toString());
@@ skipping 194 matching lines @@
 assertEquals("-1.2e+4", Number(-12345).toPrecision(2));
 assertEquals("-1.235e+4", Number(-12345.67).toPrecision(4));
 assertEquals("-1.234e+4", Number(-12344.67).toPrecision(4));
 // Test that we round up even when the last digit generated is even.
 // dtoa does not do this in its original form.
 assertEquals("1.3", 1.25.toPrecision(2), "1.25.toPrecision(2)");
 assertEquals("1.4", 1.35.toPrecision(2), "1.35.toPrecision(2)");