gh-102791: allow non-fractional decimal.Decimals to be interpreted as integers by chrisnovakovic · Pull Request #102794 · python/cpython

…ted as integers

Prior to pythongh-11952, several standard library functions that expected
integer arguments would nevertheless silently accept (and truncate)
non-integer arguments. This behaviour was deprecated in pythongh-11952, and
removed in pythongh-15636.

However, it may be possible to interpret some non-integer numeric types
(such as `decimal.Decimal`s) as integers if they contain no fractional
part. Implement `__index__` for `decimal.Decimal`, returning an integer
representation of the value if it does not contain a fractional part or
raising a `TypeError` if it does.