Sigils indicate overall interface, not the exact type of the bound
+object.  Different sigils imply different minimal abilities.

I see no mention of C<@@x> in this section.  I would assume that
C<@@x> may be bound to any object that does the C<Multidimensional>
role, with a note to the effect that the C<Multidimensional> role does
the C<Positional> role (and thus anything that C<@x> may be bound to,
C<@@x> may also be bound to).

Jonathan "Dataweaver" Lang

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