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> > 	lua_pushstring(L,s); s=lua_tostring(L,-1)
> Note that this does not work if you have multiple Lua universes since the string will have different identities in different universes.

The OP had this:
	   const char *arg = lua_tostring (L, 1);
so the strings come from Lua. But you're right: you have to register
the strings in each Lua universe you need them.