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>> Then define lua_pushuserdata to use the registry to store the Lua values
>> created by lua_newuserdatabox, using the C pointer as an index.
>> When the pointer
>> exists in the registry (or any other table), simply return the value.

>Any reason not to enable this by default (for backwards

Yes, to help make clear that the semantics of udata is now different.
Hence, the new name. But perhaps the manual could say something about this.