module T::Private::Methods::CallValidation

def self.create_validator_method(mod, original_method, method_sig, original_visibility)
  has_fixed_arity = method_sig.kwarg_types.empty? && !method_sig.has_rest && !method_sig.has_keyrest &&
    original_method.parameters.all? {|(kind, _name)| kind == :req}
  all_args_are_simple = method_sig.arg_types.all? {|_name, type| type.is_a?(T::Types::Simple)}
  has_simple_method_types =  all_args_are_simple && method_sig.return_type.is_a?(T::Types::Simple)
  has_simple_procedure_types = all_args_are_simple && method_sig.return_type.is_a?(T::Private::Types::Void)
  if has_fixed_arity && has_simple_method_types && method_sig.arg_types.length < 5 && is_allowed_to_have_fast_path
    create_validator_method_fast(mod, original_method, method_sig)
  elsif has_fixed_arity && has_simple_procedure_types && method_sig.arg_types.length < 5 && is_allowed_to_have_fast_path
    create_validator_procedure_fast(mod, original_method, method_sig)
  else
    create_validator_slow(mod, original_method, method_sig)
  end
  mod.send(original_visibility, method_sig.method_name)
end