[issue31684] Scientific formatting of decimal 0 different from float 0

[Stefan Krah]

Stefan Krah <stefan at bytereef.org> added the comment:

> I'm also assuming that Decimal(0) sets both base and exponent to 0.

No, 0 is really special in the IBM specification. The magnitude is
kept, the precision is not.

>>> Decimal("0e10") * Decimal("0e20") 
Decimal('0E+30')


>>> Decimal("0.000e10")
Decimal('0E+7')

So we're basically doing the reverse of the above in formatting when a
precision is given.

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<https://bugs.python.org/issue31684>
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