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>>>>> "Roberto" == Roberto Ierusalimschy <> writes:

 Roberto> Another idea would be to write 'luaL_testudata' inside the
 Roberto> kernel, to avoid all stack manipulation and other API
 Roberto> overheads. We would need to test first to know how much could
 Roberto> we gain with that.

If you do this, consider also providing an equivalent API that uses
lightuserdata keys rather than strings. I personally never use strings
as registry identifiers because of the risk of name collisions.