[Haskell-cafe] How to serialize thunks?

I have skimmed the serialization libraries on haskell.org (NewBinary, SerTH, AltBinary, HsSyck, GenericSerialize). I'm under the impression that these all force the data that they serialize. Is that correct? If yes: are there workarounds? I'd really like to be able to use infinite data structures in the data that I serialize. Regards, Jo