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Brett Bibby wrote:
Is it possible to set and handle metamethods from the C API?  Or can they
only be done in Lua?  Basically I want to intercept __index metamethods in
C, process them, and return the result to Lua without invoking the Lua

You can push a C function into a table's __index field and set that
table as another table's metatable, all from the C side if you like.