[perl #116695] [BUG] Wrong array length when Mu elements and delete interact in Rakudo

[Carl Mäsak]

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<pmurias> I have found a rakudo bug
<pmurias> my $foo = [0,1,2,3,4];say $foo.elems;$foo[4] = Mu;$foo[3] =
Mu;say $foo.elems;$foo.delete(4);say $foo.elems;
<masak> r: my $foo = [0,1,2,3,4];say $foo.elems;$foo[4] = Mu;$foo[3] =
Mu;say $foo.elems;$foo.delete(4);say $foo.elems
<+p6eval> rakudo 4fb07b: OUTPUT«5␤5␤3␤»
* masak submits rakuodbug
<masak> pmurias++