that's postfix ::, as mentioned in the Names section of S02.

There is no longer any special package hash such as %Foo::. Just
subscript the package object itself as a hash object, the key of which
is the variable name, including any sigil. The package object can be
derived from a type name by use of the :: postfix operator:


i don't see it anywhere in S03. probably should be, if it indeed
exists, method postfix.

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