While discussing an improved IO interface for uvector, Bryan O’Sullivan made the following request:
<pumpkin_> bos: well, dons said it would be nice to have an O(1) conversion from UArrs to strict ByteStrings and back again <dons> i'm not sure its possible though :) <bos> pumpkin_: yes, it would be nice. i would also like a pony.
And of course, this being Haskell, you can have a pony! Though it might be more abstract than what you were expecting.