> priming Brotli's (de)compressor's history buffer with...the old version...if both sides...advertise the encoding Too late to edit, but I mean a separate Acce

> priming Brotli's (de)compressor's history buffer with...the old version...if both sides...advertise the encoding Too late to edit, but I mean a separate Accept-Encoding value for the diff-like usage (brdiff or whatever), not piggy-backing on the value already being added for Brotli. Clearly if you're messing with the history buffer it's no longer Brotli-as-we-know-it.