CLN: Remove param _set_identity in MultiIndex (#36786)

Author: topper-123

pandas/core/indexes/multi.py

@@ -278,7 +278,6 @@ def __new__(
  copy=False,
  name=None,
  verify_integrity: bool = True,
- _set_identity: bool = True,
  ):
 
  # compat with Index
@@ -312,10 +311,7 @@ def __new__(
  new_codes = result._verify_integrity()
  result._codes = new_codes
 
- if _set_identity:
- result._reset_identity()
-
- return result
+ return result._reset_identity()
 
  def _validate_codes(self, level: List, code: List):
  """
@@ -1071,7 +1067,6 @@ def _shallow_copy(
  codes=None,
  sortorder=None,
  names=lib.no_default,
- _set_identity: bool = True,
  ):
  if names is not lib.no_default and name is not lib.no_default:
  raise TypeError("Can only provide one of `names` and `name`")
@@ -1091,7 +1086,6 @@ def _shallow_copy(
  sortorder=sortorder,
  names=names,
  verify_integrity=False,
- _set_identity=_set_identity,
  )
  result._cache = self._cache.copy()
  result._cache.pop("levels", None) # GH32669
@@ -1119,7 +1113,6 @@ def copy(
  codes=None,
  deep=False,
  name=None,
- _set_identity=False,
  ):
  """
  Make a copy of this object. Names, dtype, levels and codes can be
@@ -1180,7 +1173,6 @@ def copy(
  codes=codes,
  names=names,
  sortorder=self.sortorder,
- _set_identity=_set_identity,
  )
 
  if dtype: