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named
Combined from primary sources listed below.

In Parameter§

See primary documentation in context for method named. 

method named(Parameter:D: --> Bool:D)

Returns True if it's a named parameter.

my Signature $sig = :(Str $x, Bool :$is-named);
say $sig.params[0].named;                          # OUTPUT: «False␤»
say $sig.params[1].named;                          # OUTPUT: «True␤»