In a few places, an IDL type will be a pointer, but the resulting
RPC code would, ideally, be the naked type. Namely, in both resource
and asset cases, they are required to be pointers in the IDL (because
they are by-pointer by nature), but the marshaled representations need
not be pointers. This change depointerizes such types in the RPC
unless, of course, they are optional in which case pointers still make
sense. This avoids some annoying dereferencing and is the kind of thing
we want to do sooner before seeing widespread use.
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