typedef const char * (*lua_Reader) (lua_State *L,
                                        void *data,
                                        size_t *size);
<
        The reader function used by `lua_load` (see |lua_load()|). Every
        time it needs another piece of the chunk, `lua_load` calls the reader,
        passing along its `data` parameter. The reader must return a pointer
        to a block of memory with a new piece of the chunk and set `size` to
        the block size. The block must exist until the reader function is
        called again. To signal the end of the chunk, the reader must return
        `NULL`. The reader function may return pieces of any size greater than
        zero.

lua_register                                                    *lua_register()*
>c
    void lua_register (lua_State *L,
                       const char *name,
                       lua_CFunction f);
<
        Sets the C function `f` as the new value of global `name`. It is
        defined as a macro:
>c
            #define lua_register(L,n,f) \
                   (lua_pushcfunction(L, f), lua_setglobal(L, n))
<

lua_remove                                                        *lua_remove()*
>c
    void lua_remove (lua_State *L, int index);
<
        Removes the element at the given valid index, shifting down the
        elements above this index to fill the gap. Cannot be called with a
        pseudo-index, because a pseudo-index is not an actual stack position.

lua_replace                                                      *lua_replace()*
>c
    void lua_replace (lua_State *L, int index);
<
        Moves the top element into the given position (and pops it), without
        shifting any element (therefore replacing the value at the given
        position).

lua_resume                                                        *lua_resume()*
>c
    int lua_resume (lua_State *L, int narg);
<
        Starts and resumes a coroutine in a given thread.

        To start a coroutine, you first create a new thread (see
        |lua_newthread()|); then you push onto its stack the main
        function plus any arguments; then you call `lua_resume` (see
        |lua_resume()|) with `narg` being the number of arguments. This
        call returns when the coroutine suspends or finishes its execution.
        When it returns, the stack contains all values passed to `lua_yield`
        (see |lua_yield()|), or all values returned by the body function.
        `lua_resume` returns `LUA_YIELD` if the coroutine yields, 0 if the
        coroutine finishes its execution without errors, or an error code in
        case of errors (see |lua_pcall()|). In case of errors, the stack
        is not unwound, so you can use the debug API over it. The error
        message is on the top of the stack. To restart a coroutine, you put on
        its stack only the values to be passed as results from `lua_yield`,
        and then call `lua_resume`.

lua_setallocf                                                  *lua_setallocf()*
>c
    void lua_setallocf (lua_State *L, lua_Alloc f, void *ud);
<
        Changes the allocator function of a given state to `f` with user data
        `ud`.

lua_setfenv                                                      *lua_setfenv()*
>c
    int lua_setfenv (lua_State *L, int index);
<
        Pops a table from the stack and sets it as the new environment for the
        value at the given index. If the value at the given index is neither a
        function nor a thread nor a userdata, `lua_setfenv` returns 0.
        Otherwise it returns 1.

lua_setfield                                                    *lua_setfield()*
>c
    void lua_setfield (lua_State *L, int index, const char *k);
<
        Does the equivalent to `t[k] = v`, where `t` is the value at the given
        valid index `index` and `v` is the value at the top of the stack.

        This function pops the value from the stack. As in Lua, this function