comment, simplify

pandas/_libs/tslibs/timedeltas.pyx

@@ -907,12 +907,12 @@ cdef class _Timedelta(timedelta):
 
  def __hash__(_Timedelta self):
  if self._has_ns():
- if self._reso == NPY_FR_ns:
-  return hash(self.value)
- else:
-  # TODO: more performant way to do this? same problem for Timestamp
-  # Invariances we are supposed to preserve?
-  return hash((self.value, self._reso))
+ # Note: this does *not* satisfy the invariance
+ # td1 == td2 \\Rightarrow hash(td1) == hash(td2)
+ # if td1 and td2 have different _resos. timedelta64 also has this
+ # non-invariant behavior.
+ # see GH#44504
+ return self.value
  else:
  return timedelta.__hash__(self)