compress/decompress on OS X

[RGould8 at aol.com]

I've been looking through the archives, and it's sounding to me like there is 
an issue with compression/decompression in Rev, but only in Mac OS X.   I 
think I'm now witnessing this firsthand:

1)   put compress(URL "binfile://InstallAIM") into URL 
"binfile://InstallAIM4.7.gz"

This compresses the original "InstallAIM4.7" file from 3,559,694 bytes to 
3,098,808 bytes (.gz file)

2)  put decompress(URL "binfile://InstallAIM4.7.gz") into URL 
"binfile://InstallAIMresult"

This then takes that .gz file and decompresses it back to "InstallAIMresult", 
which is 3,367,676 bytes.   


It appears that what's going in is not what's coming out.   Should I be doing 
something else to this file before compressing it to make this work?   Are OS 
X apps "special" in some way?