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The problem is that the Decimal *was* supported in 2.7. So this issue can be considered not as adding new feature, but as fixing a regression. But changes are too large for just bugfix.
> It would be more consistent to support decimal.Decimal nowhere or "everywhere". IMO the new _PyTime_FromSecondsObject() (very close to _PyTime_ObjectToDenominator, but using time_t) should also be patched.
Will add Decimal support in all functions in Python/pytime.c that support floats.
> Please add some tests for decimal.Decimal in test_time directly. Usually, I try to test rounding and overflow. Testing for overflow is not always possible because it may depend on the platform.
Will do.
> Is the patch context insensitive?
No, the patch is context sensitive. I think the end user is responsible to set an appropriate context if it want to create a datetime from Decimal timestamp. At least until we add functions that return Decimal.