EA: tighten TimedeltaArray._from_sequence signature (#36731)

Author: jbrockmendel

pandas/core/arrays/timedeltas.py

@@ -214,6 +214,19 @@ def _simple_new(
 
  @classmethod
  def _from_sequence(
+ cls, data, dtype=TD64NS_DTYPE, copy: bool = False
+ ) -> "TimedeltaArray":
+ if dtype:
+ _validate_td64_dtype(dtype)
+
+ data, inferred_freq = sequence_to_td64ns(data, copy=copy, unit=None)
+ freq, _ = dtl.validate_inferred_freq(None, inferred_freq, False)
+
+ result = cls._simple_new(data, freq=freq)
+ return result
+
+ @classmethod
+ def _from_sequence_not_strict(
  cls,
  data,
  dtype=TD64NS_DTYPE,

pandas/core/indexes/timedeltas.py

@@ -153,7 +153,7 @@ def __new__(
 
  # - Cases checked above all return/raise before reaching here - #
 
- tdarr = TimedeltaArray._from_sequence(
+ tdarr = TimedeltaArray._from_sequence_not_strict(
  data, freq=freq, unit=unit, dtype=dtype, copy=copy
  )
  return cls._simple_new(tdarr, name=name)