[perl #126030] Multi-dim hash loses track of leaf type

[Aleks-Daniel Jakimenko-Aleksejev via RT]

Still reproducible (2017.11,HEAD(e5b660e))

On 2015-09-09 22:28:41, larry wrote:
> 22:22 < TimToady> m: my Bool %hash{*;*}; %hash{"a"; "b"} = True;
> 22:22 <+camelia> rakudo-moar c54773: OUTPUT«Type check failed in assignment
> to '%hash'; expected 'Bool' but got 'Hash'␤ in block <unit>
> at /tmp/NWldXMtkgi:1␤␤»