whatever slice and :delete do not mix

[colomon]

colomon: rn: my %a= (a => 1, b => 2); say %a{} :delete
[4:15pm] camelia: niecza v24-50-gba63d9a: OUTPUT«(Any)␤»
[4:15pm] camelia: ..rakudo 2a04f2: OUTPUT«1 2␤»
[4:15pm] lizmat: niecza seems wrong here
[4:15pm] colomon: rn: my %a= (a => 1, b => 2); say %a{'a'} :delete
[4:15pm] camelia: rakudo 2a04f2, niecza v24-50-gba63d9a: OUTPUT«1␤»
[4:16pm] colomon: rn: my %a= (a => 1, b => 2); say %a{}
[4:16pm] camelia: rakudo 2a04f2, niecza v24-50-gba63d9a: OUTPUT«1 2␤»