Hello Krasimir, Thursday, December 08, 2005, 5:40:15 PM, you wrote: KA> the stream. What I want is to have a single Binary library that is KA> fast and that have all these features: KA> - fast implementation KA> - optional serialization of cyclic datastructures KA> - optional support for bit level serialization KA> - automatic class derivation based on TH KA> If there are voluntiers I would like to cooperate in the development. imho, it's better to start from NewBinary library and add features of SerTH to it. i can make TH support. btw, where i can download NewBinary version about you talk? there is many different variations. one disadvantage of original Binary library as well as all its derivatives is support only for memory- and Handle-oriented streams. my library instead accepts any stream, you just provide functions to read/write when create Binary object. i propose to add this facility too, smth like: createBinary readF writeF = return Binary {readF=readF,writeF=writeF} createBinary4File h = createBinary (hGetChar h) (hPutChar h) createBinary4Memory addr size = do ptr <- newIORef addr let read = do ... write = do ... createBinary read write -- Best regards, Bulat mailto:bulatz@HotPOP.com