Xavier Morel
70599807a1
In Python 3 round:
* rounds half to even (banker's rounding) rather than up
* returns an int if not given a precision (or given a precision of
None)
* discards the negative sign when rounding to 0
Add a compatibility shim which implements P2 behaviour and at least
allows passing float_utils's tests.
Implementing float_round on top of Decimal was attempted but did not
work: although Decimal.quantize takes a non-integral
Decimal (e.g. ``d.quantize(D('0.001'))``) it only supports integral
powers of 10 and does not support quantizing to e.g. 0.05: while that
will not fail it will just use the exponent for quantization and 0.05
is thus equivalent to 0.01, which is not what we want if e.g. need to
round a value to 5 cents.
This is hinted at but maybe not clearly spelled out by the official
documentation:
> Return a value equal to the first operand after rounding
> and **having the exponent of** the second operand.
Also convert a bunch of hand-rolled currency rounding to just using
the round() method on res.currency.
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