Fix error on 0.0 with format "g/G" #93
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After my erroneous patch (04baaf3), the
floor(Int, log10(x))
would trigger InexactError ifx == 0.0
. This PR address that and add an extensive testset to prevent regression. The testset is GPT-5 generated but I have reviewed and edited it manually.The testset validate current behavior instead of Python's. If in the future "g/G" is set to remove trailing zeros, it has to be edited. A FIXME has been added to remind future maintainers.