Elizabeth Mattijsen via RT wrote: >dd9b760 makes it impossible to create a Pair with a mutable key.
Doesn't work. It defeats my original test case, but you're not actually type-constraining the key, you're only removing a container wrapper. So by adding a second container: > my $a = 3; my $A = $a.VAR; my $b = Pair.new($A.VAR, "z"); say $b.WHICH; $a = > 5; say $b.WHICH Pair|Int|3|Str|z Pair|Int|5|Str|z It would be better to reject the Scalar-as-key case entirely, rather than unwrap. -zefram
