[perl #76928] [BUG] undefined value for a missing hash optional argument does not know its metaclass.

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# New Ticket Created by  Stephane Payrard 
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>  sub a( %h?) { say %h.HOW }; a();
Method 'HOW' not found for invocant of class 'Hash'

Also I would expect it to DWIM in a code like that

sub a( %h?, *%h1) { say "{%h.defined} {%h1.defined}";  say  {%h, %h1}.keys };
a( :b );

-- 
cognominal stef