lua_pushfstring: '%L' inserts a lua_Integer?

[张睿 <zrui16@...>]

The document of lua_pushfstring says '%L' inserts a lua_Integer. I tried:

lua_pushfstring(L, "%L", (lua_Integer) 0);

… and got:

PANIC: unprotected error in call to Lua API (invalid option '%L' to 'lua_pushfstring')