[perl #65864] Having an optional variable in the signature of a 'my' declaration makes Rakudo blow up

[Carl Mäsak]

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<masak> rakudo: my (%h?)
<p6eval> rakudo 14bba5: OUTPUT«get_pmc_keyed_str() not implemented in
class 'String' [...]
<masak> jnthn: bug? :)
<masak> std: my (%h?)
<p6eval> std 26892: OUTPUT«ok 00:02 37m␤»
<PerlJam> but what does it mean? :)
<TimToady> it means that *if* you were to bind to it, it would be optional
<jnthn> masak: I'm not even sure where it's blowing up...
<jnthn> oh, runtime.
<jnthn> Hmm
<jnthn> masak: It shouldn't crash like that.
* masak submits rakudobug
<jnthn> But I'm not really sure what it means... :-)
<TimToady> rakudo: my (%h?) := ()
<p6eval> rakudo 14bba5:  ( no output )