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I reviewed datetime_fromtimestamp_decimal.patch.
> As side effect Decimal timestamps now are supported in few other places, e.g. in os.utime().
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.
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.
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See also the PEP 410: "PEP 410 - Use decimal.Decimal type for timestamps". The PEP was rejected. The compromise was a new timestamp format for os.utime(): a number of nanoseconds since the UNIX epoch (1970年01月01日). I partially implemented a private API for this PEP in the issue #22117: the new _PyTime_t is a number of timestamp using an arbitrary resolution (currently, it's a number of nanoseconds using a 64-bit signed integer type).