luaL_len[-0, +0, e]
1 | lua_Integer luaL_len (lua_State *L, int index); |
Returns the "length" of the value at the given index as a number; it is equivalent to the '#' operator in Lua (see §3.4.7). Raises an error if the result of the operation is not an integer. (This case only can happen through metamethods.)
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