In Sets, bags, and mixes§

See primary documentation in context for infix ⊅

Returns True if $a is not a strict superset of $b, else False. More information, Wikipedia definition.

In Operators§

See primary documentation in context for infix ⊅

multi sub infix:<>($a,$b --> Bool:D)

Not a superset of operator.

Returns True if $a is not a strict superset of $b. Equivalent to !(>).

say (1,2,3 (2,3,1); # OUTPUT: «True␤» 
say (1,2,3 (2,3);   # OUTPUT: «False␤» 
say 4 !(>) (1,2,3);    # OUTPUT: «True␤»