String buffers, part 1: object serialization.

Sponsored by fmad.io.

src/lib_string.c

@@ -743,6 +743,9 @@ LUALIB_API int luaopen_string(lua_State *L)
   setgcref(basemt_it(g, LJ_TSTR), obj2gco(mt));
   settabV(L, lj_tab_setstr(L, mt, mmname_str(g, MM_index)), tabV(L->top-1));
   mt->nomm = (uint8_t)(~(1u<<MM_index));
+#if LJ_HASBUFFER
+  lj_lib_prereg(L, LUA_STRLIBNAME ".buffer", luaopen_string_buffer, tabV(L->top-1));
+#endif
   return 1;
 }