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Hm, I tried a modified version of your first test, and I found another 
problem with the current zlib library;
starting with the input:
x = x1 + x2 + HAMLET_SCENE # both compressed and uncompressed data
The following scenario is OK:
dco.decompress(x) # returns HAMLET_SCENE
dco.unused_data # returns HAMLET_SCENE
But this one:
for c in x:
 dco.decompress(x) # will return HAMLET_SCENE, in several pieces
dco.unused_data # only one character, the last of (c in x)!
This is a bug IMO: unused_data should accumulate all the extra uncompressed 
data.