[perl #101448] [BUG] No error on assigning a type object to a :D-constrained container in Rakudo

[Carl Mäsak]

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<masak> masak's first rule of repeated community volunteer
contribution: "Task needs be well-defined, atomic, and result in
instant gratification on completion."
<moritz> nom: my Int:D $x; say $x
<p6eval> nom 25af2d: OUTPUT«Int()␤»
<moritz> nom: my Int:D $x; $x = Int; say $x
<p6eval> nom 25af2d: OUTPUT«Int()␤»
<moritz> masak: wanna submit rakudobug? :-)
* masak submits rakudobug
<masak> whee! \o/

Observed: type object settles in nicely in container which only
accepts defined values. Expected: error on assignment.