levelForXp 10
--> 1


levelForXp 82
--> 1


levelForXp 83
--> 2


levelForXp 84
--> 2


levelForXp 200000000
--> 120

xpRemaining 10
--> Just 73


xpRemaining 82
--> Just 1


xpRemaining 83
--> Just 91


xpRemaining (104 * 10^6)
--> Just 273167


xpRemaining (105 * 10^6)
--> Nothing