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layer handling:
bit packing
state parameters
string pools
reading structures from the end of a stream, seek/tell behaviour
seek based protocols are too hard.
hGetContents/ interleaving.
user requests:
get remaining bytestring after a runGet
some kind of lookahead, or restoring parsing state, or something with
equal functionality. make it another layer on top?
getLazyByteString takes an Int, which in Haskell98 is only guarantied to
be 29 bits, ie. 512 mb.
maybe we should have a readN64 for allowing reading of larger stuff?
(which could be implemented with readN on 64bit machines)
reference: bringerts tar archive decoder would be limitid to 0.5GB
files, alt. 2GB in GHC
SYB-deriving
investigate the UArray instance, it does not seem to compile in GHC 6.4
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