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** offset(s, n, [i]) -> index where n-th character counting from ** position 'i' starts; 0 means character at 'i'. */

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** Auxiliary function to call 'luaF_close' in protected mode. */

** codepoint(s, [i, [j [, lax]]]) -> returns codepoints for all ** characters that start in the range [i,j] */

** Calls 'lua_getinfo' and collects all results in a new table. ** L1 needs stack space for an optional input (function) plus ** two optional outputs