module ActiveSupport::Cache::SerializerWithFallback::Marshal70WithFallback

def _load(marked)
  dumped = marked.byteslice(1..-1)
  dumped = Zlib::Inflate.inflate(dumped) if marked.start_with?(MARK_COMPRESSED)
  Cache::Entry.unpack(marshal_load(dumped))
end

def dump(entry)
  MARK_UNCOMPRESSED + Marshal.dump(entry.pack)
end

def dump_compressed(entry, threshold)
  dumped = Marshal.dump(entry.pack)
  if dumped.bytesize >= threshold
    compressed = Zlib::Deflate.deflate(dumped)
    return MARK_COMPRESSED + compressed if compressed.bytesize < dumped.bytesize
  end
  MARK_UNCOMPRESSED + dumped
end

def dumped?(dumped)
  dumped.start_with?(MARK_UNCOMPRESSED, MARK_COMPRESSED)
end