Use the default handling of optionals

This is strict handling, but allows implicit declarations.

setup.cfg

@@ -34,11 +34,6 @@ disallow_any_generics = True
 
 disallow_subclassing_any = True
 
-# Ensure that optional types are explicit, aiding clarity and ensuring that
-# consumers have the choice to enable these if they want to.
-no_implicit_optional = True
-strict_optional = True
-
 # Avoid creating future gotchas emerging from bad typing
 warn_redundant_casts = True
 warn_unused_ignores = True