[perl #123776] [BUG] Binding a variable at BEGIN time doesn't stick aruond for runtime

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m: my $a; BEGIN { $a := 1; say $a; }; say $a;
rakudo-{parrot,moar} 0cb22e: OUTPUT«1␤(Any)␤»

m: my $a; BEGIN { $a = 1; say $a; }; say $a; # works with assignment
rakudo-{parrot,moar} 0cb22e: OUTPUT«1␤1␤»