Card.IsReleasable: REASON_COST by default

libcard.cpp

@@ -2410,7 +2410,7 @@ int32 scriptlib::card_is_releasable(lua_State *L) {
 	check_param(L, PARAM_TYPE_CARD, 1);
 	card* pcard = *(card**) lua_touserdata(L, 1);
 	uint32 p = pcard->pduel->game_field->core.reason_player;
-	uint32 reason = 0;
+	uint32 reason = REASON_COST;
 	if (lua_gettop(L) >= 2)
 		reason = (uint32)lua_tointeger(L, 2);
 	if(pcard->is_releasable_by_nonsummon(p, reason))

libduel.cpp

@@ -4334,7 +4334,7 @@ int32 scriptlib::duel_is_player_can_release(lua_State * L) {
 		check_param_count(L, 2);
 		check_param(L, PARAM_TYPE_CARD, 2);
 		card* pcard = *(card**) lua_touserdata(L, 2);
-		uint32 reason = 0;
+		uint32 reason = REASON_COST;
 		if (lua_gettop(L) >= 3)
 			reason = (uint32)lua_tointeger(L, 3);
 		lua_pushboolean(L, pduel->game_field->is_player_can_release(playerid, pcard, reason));