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Fix %g format panic and trailing decimal point bugs #19

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Fix %g format panic and trailing decimal point bugs #19

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@thatfool thatfool commented Jan 10, 2026

This fixes the following formatting bugs:

  • %e 0 -> NaN.000000e-2147483648
  • %g 0 -> panic (attempt to subtract with overflow)
  • %4g 1 -> 001. (instead of 0001)
  • %.2g, 1 -> 1. (instead of 1)

Some of these were previously mentioned in #18.

@thatfool
Add test cases that show formatting bugs
32ebe91
@thatfool
Fix panic on formatting 0
e5a7941 
For 0, log10() returns -inf, which is inconvenient.
@thatfool
Fix compact float (%g) bug
f2644eb 
When trimming trailing zeroes removes all zeroes after the decimal
point, remove the decimal point too.
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