[perl #129063] Range.contains bug

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liukan@candor:~/Code$ cat foo
my $r = 1 .. 19; ( 0 .. 20 ).map: { $r.contains( $_ ).say };

liukan@candor:~/Code$ perl6 foo
True
True
True
True
True
True
True
True
True
True
True
True
True
True
True
True
True
True
True
True
False