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> Is there any way to find out from Lua what the registry type of a
> userdata is, short
> of giving it a `type` method?

If you used luaL_newmetatable to assign a metatable to the udata,
then you can search the registry for an entry whose value is that
metatable. The key is then the "type" you seek.

This example print "FILE*":

for k,v in pairs(debug.getregistry()) do
	if v==t then print(k) end