Aug 30, 2025 · Aug 23, 2025 · Aug 27, 2025 · Aug 27, 2025 · Aug 28, 2025 · Aug 28, 2025
diff --git a/mypy/checkexpr.py b/mypy/checkexpr.py
        # We suppress the error for equality and container checks if there is a custom __eq__()
        # method on either side. User defined (or even standard library) classes can define this
        # to return True for comparisons between non-overlapping types.
        if (custom_special_method(left, "__eq__") or custom_special_method(right, "__eq__")) and not identity_check:
        if (
            custom_special_method(left, "__eq__") or custom_special_method(right, "__eq__")
        ) and not identity_check:
            return False

        if prefer_literal:
diff --git a/mypy/main.py b/mypy/main.py
        default=False,
        strict_flag=True,
        help="Prohibit equality, identity, and container checks for non-overlapping types "
 "(except `None`)",
        "(except `None`)",
        group=strictness_group,
    )
Original file line number	Diff line number	Diff line change
Expand Up		@@ -3794,7 +3794,9 @@ def dangerous_comparison(
		# We suppress the error for equality and container checks if there is a custom __eq__()
		# method on either side. User defined (or even standard library) classes can define this
		# to return True for comparisons between non-overlapping types.
		if (custom_special_method(left, "__eq__") or custom_special_method(right, "__eq__")) and not identity_check:
		if (
		custom_special_method(left, "__eq__") or custom_special_method(right, "__eq__")
		) and not identity_check:
		return False

		if prefer_literal:
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Original file line number	Diff line number	Diff line change
Expand Up		@@ -906,7 +906,7 @@ def add_invertible_flag(
		default=False,
		strict_flag=True,
		help="Prohibit equality, identity, and container checks for non-overlapping types "
		"(except `None`)",
		"(except `None`)",
		group=strictness_group,
		)

Expand Down