[issue5780] test_float fails for 'legacy' float repr style

[Eric Smith]

Eric Smith <eric at trueblade.com> added the comment:

I definitely think that if you go with isdigit, you need the macro. I've
been bitten by this in 3.0.

My actual suggestion is to go with isdigit and the macro everywhere in
this file and all files.

But for just this checkin, ISDIGIT is probably best.

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