AnyElement oid is always zero

[syvb]

I'm trying to upgrade an extension that uses AnyElement to the 0.5 beta, and it looks like the AnyElement::oid of the type in the AnyElement is always zero, when an AnyElement is passed in from Postgres. AnyElement::oid worked fine in 0.4.5.

Here's a simplified test case with a failing test: https://gist.github.com/Smittyvb/b1ee0bffcf413b85cefe1351caedfaf6

[workingjubilee]

I'll try to find out if this can be fixed but if you have FunctionCallInfo you want to break down (a very likely situation for needing AnyElement in the first place) then the workaround for now is to use pgx::fcinfo::get_getarg_typepg_getarg_type.