…lace as exception branch
…a test for Mu
When defining a global grammar for later use, the return value of the stored procedure was a Grammar object, which PL/Perl6 did not know how to convert to a Postgres datatype, so the sausage machine came to a grinding halt. We catch these and just return a true value instead. There is currently a bug in Rakudo where Grammar.WHAT is "Code", and somehow that gets turned into a "Sub", so that was worked around as well.
…holder variables work now
…the signature of the Perl 6 code
…e definedness of @_