boxed FastTypes

[Isaac Dupree]

while it isn't really relevant to the ghc porting work itself...

For compilers in which FastInt = Int, _there is less strictness_ because 
of special treatment of unboxed types.  Therefore it may be slower or 
even have memory leaks.  To partially remedy this, What if in data types 
everywhere
data Foo = Foo FastInt
becomes
data Foo = Foo !FastInt
(the strictness annotation simply has no additional effect when FastInt 
= Int# )
or even
data Foo = Foo {-#UNPACK#-}!FastInt
(why not - it could help some compilers without doing much harm nor 
extensions - though it's getting ugly)


-Isaac