Add .to_s('F') digit grouping for integer part #264
Merged
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Right now to_s('F') digit grouping works properly only for fractional part. For integer part result is unspecified. In reality we also get grouping, but of unpractical nature:
This patch fixes grouping of integer part:
I consider this change backwards compatible as:
a) docs say only about grouping fractional part, no declarations about grouping integer part,
b) total string length without changes,
c) integer part grouping didn't make sense so there should be no or not much real life dependencies.
Also added some tests.