[docs] [issue19933] Round default argument for "ndigits"

[Mark Dickinson]

Mark Dickinson added the comment:

Thanks.  It's inaccurate to say that a float is returned in general, though:  for most builtin numeric types, what's returned has the same type as its input.  So rounding a Decimal to two places gives a Decimal on output, etc.  (That's already explained in the next paragraph.)

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<http://bugs.python.org/issue19933>
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