While looking at 'zip.h' i notice a function 'zip_set_file_compression' that is not replicated in 'libzim.nim'. This might be a clue that I can investigate as that would allow use of 'ZIP_CM_DEFLATE (old 32-bit format) and 'ZIP_CM_DEFLATE64' (which I am assuming id the default). I am working on writing an 'epub' and I think they prefer the 32-bit format.
