String keys for `:D` do not work

[nick-paul]

aya> 1 "foo" {,} :D
Type error at (:D):
        Expected ((ASD|AJD))
        Received ({,} 'f 1 )
   in :D .. }

Converting to a symbol works as expected

aya> 1 "foo":S {,} :D
{,
  1:foo;
}