What happens if you load Terraria 1.4 world in 1.3??? (doing various research in Terraria 1.4 #3)

...we also load Modded 1.3 world to 1.4, as well as loading corrupted save file, and even more than that! Like:
-Is Zenith OP? (yes)
-Does projectile self-explode?
-Can I spell lizhard correctly?
-...is Cuphead harder than Terraria?...
-....and other stupid stuffs!

Yay! It was really not fun, since I had to re-record the footage. So it's not my true experience. Also, there was no time to edit this video, so please don't point my engrish and the an grammar thank you.

Anyway, Loading Terraria 1.4 world in 1.3... is actually impossible, they just locked it. Even the Tedit won't open it, and it'll crash. If it crashes Tedit, nothing will open the holy 1.4 world... except for the Terraria 1.4, that is.

No, I don't have 1.2, 1.1, and 1.0 Verison of Terraria, I cannot test them, but probably result will be the same. I guess.

Oh, and although focus of this video is "loading world", but I made some extra content. Enjoy, Thanks for watching, now I'm going to finish that minecraft video.

Used Music
-At the fair
-Black and White
-Journey's Beginning
-Terraria title screen
-English country garden
-Terraria calamity mod, void, go listen here:
   • Terraria Calamity Mod Music - "void" ...  
-Terraria old-console title theme
-The big gun
-Terraria windy day
-Touching moment
-Terraria otherworld jungle
-Eyes of Glory
-Terraria day
-[REDACTED]
-How it Began (outro)

...current my feeling matches with
-Terraria calamity mod, void, go listen here:
   • Terraria Calamity Mod Music - "void" ...