ALL7EMERALDS is a boolean you idiot, not an integer.

src/lua_mathlib.c

@@ -156,7 +156,7 @@ static int lib_getsecspecial(lua_State *L)
 
 static int lib_all7emeralds(lua_State *L)
 {
-	lua_pushinteger(L, ALL7EMERALDS(luaL_checkinteger(L, 1)));
+	lua_pushboolean(L, ALL7EMERALDS(luaL_checkinteger(L, 1)));
 	return 1;
 }