[issue1580] Use shorter float repr when possible

[Tim Peters]

Tim Peters <tim.peters at gmail.com> added the comment:

Huh.  I didn't see Preston volunteer to do anything here ;-)

One bit of software engineering for whoever does sign on:  nothing kills
porting a language to a new platform faster than needing to get an
obscure but core subsystem working.  So whatever is done here, to the
extent that it requires fiddling with obscure platform-specific gimmicks
for manipulating FPU state, to that extent also is it important to
retain a std C fallback (i.e., one requiring no porting effort).

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