Reading and writing

readArray#       :: MutableArray# s elt -> Int# -> State# s -> StateAndPtr#    s elt
readCharArray#   :: MutableByteArray# s -> Int# -> State# s -> StateAndChar#   s
readIntArray#    :: MutableByteArray# s -> Int# -> State# s -> StateAndInt#    s
readAddrArray#   :: MutableByteArray# s -> Int# -> State# s -> StateAndAddr#   s 
readFloatArray#  :: MutableByteArray# s -> Int# -> State# s -> StateAndFloat#  s 
readDoubleArray# :: MutableByteArray# s -> Int# -> State# s -> StateAndDouble# s 

writeArray#       :: MutableArray# s elt -> Int# -> elt     -> State# s -> State# s 
writeCharArray#   :: MutableByteArray# s -> Int# -> Char#   -> State# s -> State# s 
writeIntArray#    :: MutableByteArray# s -> Int# -> Int#    -> State# s -> State# s 
writeAddrArray#   :: MutableByteArray# s -> Int# -> Addr#   -> State# s -> State# s 
writeFloatArray#  :: MutableByteArray# s -> Int# -> Float#  -> State# s -> State# s 
writeDoubleArray# :: MutableByteArray# s -> Int# -> Double# -> State# s -> State# s