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> Perhaps the limit LUA_MAXCSTACK should be an arbitrary number, but the
> other macros that are dependent on this value, such as
> LUA_REGISTRYINDEX et. al., should just subtract from this maximum
> stack value. e.g.
> Currently it's misleading that one could change LUA_MAXCSTACK without
> consequences when it must be less than the absolute value of these...
> values.

Even the patch includes a comment about this:

	 (must be smaller than -LUA_REGISTRYINDEX)

For the future (5.2) we will define LUA_REGISTRYINDEX
based on LUA_MAXCSTACK.  For 5.1, explains why not.

-- Roberto