[perl #76510] [BUG] =:= doesn't seem to work as spec'd in Rakudo

[Carl Mäsak via RT]

<moritz_> rakudo: my ($a, $b); say $a =:= $a, $a =:= $b
<p6eval> rakudo c8b6cf: OUTPUT«10␤»
<moritz_> rakudo: sub f($x, $y) { $x =:= $y }; my ($a, $b); say f($a, $a), 
f($a, $b)
<p6eval> rakudo c8b6cf: OUTPUT«00␤»
<moritz_> bug?
* masak adds that one to the ticket