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I have C API question:

In a first metatable I set the __index field to a function that checks if the key is a number.  If it is, it returns some data value, nil otherwise.  Now I want to nest a second metatable, that has a table of functions at the __index field.

I don't seem to get that to work. The functions in the second metatable are never called. I am probably setting the metatable on the wrong field of the first metatable.  So on which field of the first metatable do I set the second metatable, on the metatable itseld, the __index field or the (C) function returning either a value or nil?

Do some C examples of such nesting exist anywhere?