From 7c17b37f0e2e85a0d5b4102313c3a5f41974e3d8 Mon Sep 17 00:00:00 2001
From: Brock <jbrockmendel@gmail.com>
Date: Mon, 13 Feb 2023 07:16:18 -0800
Subject: [PATCH] CLN: indexing checks

---
 pandas/core/indexes/base.py | 15 ++++++++-------
 pandas/core/series.py       |  2 +-
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/pandas/core/indexes/base.py b/pandas/core/indexes/base.py
index 363bfe76d40fb..2b55e0c8c1d0e 100644
--- a/pandas/core/indexes/base.py
+++ b/pandas/core/indexes/base.py
@@ -3732,10 +3732,11 @@ def get_indexer(
             # Only call equals if we have same dtype to avoid inference/casting
             return np.arange(len(target), dtype=np.intp)
 
-        if not is_dtype_equal(self.dtype, target.dtype) and not is_interval_dtype(
-            self.dtype
-        ):
-            # IntervalIndex gets special treatment for partial-indexing
+        if not is_dtype_equal(
+            self.dtype, target.dtype
+        ) and not self._should_partial_index(target):
+            # _should_partial_index e.g. IntervalIndex with numeric scalars
+            #  that can be matched to Interval scalars.
             dtype = self._find_common_type_compat(target)
 
             this = self.astype(dtype, copy=False)
@@ -5739,9 +5740,9 @@ def get_indexer_non_unique(
         target = ensure_index(target)
         target = self._maybe_cast_listlike_indexer(target)
 
-        if not self._should_compare(target) and not is_interval_dtype(self.dtype):
-            # IntervalIndex get special treatment bc numeric scalars can be
-            #  matched to Interval scalars
+        if not self._should_compare(target) and not self._should_partial_index(target):
+            # _should_partial_index e.g. IntervalIndex with numeric scalars
+            #  that can be matched to Interval scalars.
             return self._get_indexer_non_comparable(target, method=None, unique=False)
 
         pself, ptarget = self._maybe_promote(target)
diff --git a/pandas/core/series.py b/pandas/core/series.py
index 8934b7c65130b..78c6cc9f94ed2 100644
--- a/pandas/core/series.py
+++ b/pandas/core/series.py
@@ -1111,7 +1111,7 @@ def __setitem__(self, key, value) -> None:
         except KeyError:
             # We have a scalar (or for MultiIndex or object-dtype, scalar-like)
             #  key that is not present in self.index.
-            if is_integer(key) and self.index.inferred_type != "integer":
+            if is_integer(key):
                 if not self.index._should_fallback_to_positional:
                     # GH#33469
                     self.loc[key] = value