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> Unfortunately it looks like rawset() doesn't like being called with its
> third argument being "nothing" and not nil.  Would it be possible for Lua
> upstream to have it instead coerce nothing to nil?  

The signature of rawset is
        rawset (table, index, value)

The intent is to set a value in a table. If no value is given, this is
clearly a mistake by the programmer. There are places where an argument
may be optional, but I don't think this is one of them.