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fix(core): keep empty and incomplete FlateDecode streams with pako 2.2 (#152)

pako 2.1 returned nothing for empty or incomplete deflate input, and
FlateFilter then kept the stream bytes as they were. pako 2.2.0
(2026-06) throws "buffer error" instead, so with a fresh install an
empty FlateDecode stream made decoding fail with "Cannot decode the
stream using the FlateDecode filter". Treat that error as before, for
pako 2.2 (a string) and 3 (an Error).

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