settings frame should not alter the connection flow window size
Merge branch 'master' into kazuho/expr/pulling-generator
[refactor] `capacity` represents either minimum initial capacity or current capacity, `bytes` is now used to determine if the buffer is a prototype
Merge branch 'kazuho/expr/inbuf-initial-size' into kazuho/expr/pulling-generator
[http2] send at max the capacity of the output buffer
[http2] utilize the pull interface