Doc: clarify approx behavior regarding int and bools (#13341) (#13352)

Fixes #13218

(cherry picked from commit 6964cf1)

Co-authored-by: Natalia Mokeeva <[email protected]>

Author: patchback[bot]

changelog/13218.doc.rst

@@ -0,0 +1 @@
+Pointed out in the :func:`pytest.approx` documentation that it considers booleans unequal to numeric zero or one.

src/_pytest/python_api.py

@@ -697,6 +697,15 @@ def approx(expected, rel=None, abs=None, nan_ok: bool = False) -> ApproxBase:
         from the
         `re_assert package <https://github.com/asottile/re-assert>`_.
 
+
+    .. note::
+
+        Unlike built-in equality, this function considers
+        booleans unequal to numeric zero or one. For example::
+
+           >>> 1 == approx(True)
+           False
+
     .. warning::
 
        .. versionchanged:: 3.2