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Need clarification of Abstract versus Concrete type specifiers
We need clarification for current intent of http://perlcabal.org/syn/S12.html#Abstract_vs_Concrete_types in the context of the discussion starting at http://irclog.perlgeek.de/perl6/2011-12-08#i_4808300 .
This ties into the ongoing discussion about the correct handling of Failure.