[issue7048] decimal.py: logb: round the result if it is greater than prec

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

The IEEE 754-2008 description of scaleB makes a lot more sense, IMO:
scaleB(x, N) is simply x*10**N (assuming that B=10 and N is integral), 
rounded in the usual way.

The restriction in the specification seems arbitrary and questionable.  
Presumably it's intended to aid implementation in low-level languages.

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