@eniko I threw together a msgpack -> enikoJSON, but with 'p' for positive LEB128-encoded integer, 'm' for negative LEB128-encoded integer, 0 terminated keys/strings, 'f' for 32-bit float, 'd' for 64-bit float, plus a 'b' for length-prefixed arbitrary binary data and 'N' for null: https://p.mort.coffee/M9S.cc
Files are slightly smaller with msgpack than this format (5927B vs 6264B; 4951B vs 5043B gzipped). But it's sooo much simpler. Hm.