CLN: rename confusing variable name (#51690)

Author: topper-123

pandas/_libs/algos.pyx

@@ -752,7 +752,7 @@ def is_monotonic(ndarray[numeric_object_t, ndim=1] arr, bint timelike):
  tuple
  is_monotonic_inc : bool
  is_monotonic_dec : bool
- is_unique : bool
+ is_strict_monotonic : bool
  """
  cdef:
  Py_ssize_t i, n

pandas/_libs/index.pyx

@@ -256,24 +256,24 @@ cdef class IndexEngine:
 
  cdef _do_monotonic_check(self):
  cdef:
- bint is_unique
+ bint is_strict_monotonic
  if self.mask is not None and np.any(self.mask):
  self.monotonic_inc = 0
  self.monotonic_dec = 0
  else:
  try:
  values = self.values
- self.monotonic_inc, self.monotonic_dec, is_unique = \
+ self.monotonic_inc, self.monotonic_dec, is_strict_monotonic = \
  self._call_monotonic(values)
  except TypeError:
  self.monotonic_inc = 0
  self.monotonic_dec = 0
- is_unique = 0
+ is_strict_monotonic = 0
 
  self.need_monotonic_check = 0
 
- # we can only be sure of uniqueness if is_unique=1
- if is_unique:
+ # we can only be sure of uniqueness if is_strict_monotonic=1
+ if is_strict_monotonic:
  self.unique = 1
  self.need_unique_check = 0