Hmm, I guess, ironically, lz4 does not do a Huffman pass, unlike most other compression algorithms. It only does dictionary-matching, which I imagine has a tougher time squeezing the zeros out of fixed-width-encoded integers.

I wonder if this implies lz4 pairs well with Protobuf (since it does Varint) but that Cap'n Proto users should look at different algorithms (or maybe apply packing followed by lz4).

Source: https://en.wikipedia.org/wiki/LZ4_(compression_algorithm)