Subset of https://github.com/qpackers/qifs (commit da52cd936b3e34dac7ac12aa8066fc57676af106, MIT, see LICENSE.md):
the source QIFs and the `qpack-06` encoder outputs made with a dynamic table capacity of 0
(`*.out.0.0.0`), which the v0.1 decoder must decode. Used by `h3wire/tests/qif.rs`.