规范代码，大量xxx=nil换成xxx=false

parts/modes/bigbang.lua

@@ -5,7 +5,6 @@ return{
 		drop=1e99,lock=1e99,
 		holdCount=0,
 		dropPiece=function(P)P:lose()end,
-		task=nil,
 		bg="bg1",bgm="new era",
 	},
 	pauseLimit=true,

parts/modes/custom_clear.lua

@@ -61,7 +61,7 @@ return{
 		PLY.newPlayer(1)
 		local L=GAME.modeEnv.opponent
 		if L~=0 then
-			GAME.modeEnv.target=nil
+			GAME.modeEnv.target=false
 			if L<6 then
 				PLY.newAIPlayer(2,AIBUILDER("9S",2*L))
 			else

parts/modes/custom_puzzle.lua

@@ -42,7 +42,7 @@ return{
 		PLY.newPlayer(1)
 		local L=GAME.modeEnv.opponent
 		if L~=0 then
-			GAME.modeEnv.target=nil
+			GAME.modeEnv.target=false
 			if L<6 then
 				PLY.newAIPlayer(2,AIBUILDER("9S",2*L))
 			else

parts/modes/master_phantasm.lua

@@ -7,7 +7,7 @@ local function check_LVup(P)
 		--Stage 1: clear 3 techrash
 		if T==12 then--Stage 2: swap color of S/Z & J/L
 			P.waiting=30
-			P.curMission=nil
+			P.curMission=false
 
 			ENV.skin[1],ENV.skin[2]=ENV.skin[2],ENV.skin[1]
 			ENV.skin[3],ENV.skin[4]=ENV.skin[4],ENV.skin[3]