Strings that differ in only a few places don't get unique hash values
from MLton.hash. In a program where I tried to use MLton.hash I had 38
collisions out of 8325 distinct input strings. Not good.
val x = "klahjflaskjflaksjfgklajsglkasjglaksjglaksjglaksgjaklsgaslkgjaslgkjas"
val y = "klahjflbskjflaksjfgklajsglkasjglaksjglaksjglaksgjaklsgaslkgjaslgkjaS"
val () = print (Word32.toString (MLton.hash x) ^ "\n")
val () = print (Word32.toString (MLton.hash y) ^ "\n")
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