message: Quick fix to _convert_inputs_to_signature return val
diff: @@ -2803,7 +2803,7 @@ def _convert_inputs_to_signature(inputs, input_signature, flat_input_signature):
  flat_sequence=flatten_inputs,
  expand_composites=True)
  - return inputs, flatten_inputs
  + return inputs, nest.flatten(inputs, expand_composites=True)
  class FunctionCache(object):
  