drupflare/worker - v1.0.4
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    Variable DICTIONARY_OPSConst

    DICTIONARY_OPS: readonly ["zlib", "unzlib"] = ...

    The ops a preset dictionary may be used with: zlib only, because gzip has no header field for one and a raw stream has no dictionary checksum. They run on node:zlib, not fflate: given a wrong dictionary it answers "Bad dictionary" where fflate returns plausible garbage.