Enable extra mypy strictness for extra safety

strict equality added in python/mypy#6370

Author: jstasiak

mypy.ini

@@ -12,6 +12,8 @@ disallow_untyped_decorators = true
 no_implicit_optional = true
 warn_unused_ignores = true
 warn_return_any = true
+disallow_any_generics = true
+strict_equality = true
 
 # TODO: enable this at some point
 # disallow_untyped_calls = true