Attempt to fix mypy false positive on Union tuple types

Author: pushfoo

arcade/sprite/base.py

@@ -341,7 +341,9 @@ def color(self, color: ColorLike):
                 self._color == color[0]
                 and self._color[1] == color[1]
                 and self._color[2] == color[2]
-                and self._color[3] == color[3]
+                # Union types set off false positives in mypy:
+                # https://github.com/python/mypy/issues/1178
+                and self._color[3] == color[3]  # type: tuple[int, int, int, int]
             ):
                 return
             self._color = Color(color[0], color[1], color[2], color[3])