treat_symbols_as_metadata_keys_with_true_values doesn't effect example.metadata in around block

Created by: docwhat

If you have treat_symbols_as_metadata_keys_with_true_values set and you have an around hook, the example Proc's metadata won't have keys set as true when passed from the example definition.

I have written a test that demonstrates the problem.

I also fixed a minor typo in a separate commit.