- Downloads resolve streams with the user's download format/quality via a
new StreamRequest instead of the streaming settings, and bypass the
playback stream-URL cache in both directions
- Downloads only consider progressive streams; DASH/HLS manifests were
previously saved as-is instead of audio
- NewPipe: map AAC "mp4a.40.x"/"m4a" to the advertised "aac"/"mp4" so real
AAC streams can match (previously the hard-coded aac/mp4 manifests always
won), report each stream's real delivery method, skip streams without a
format or non-URL content
- Fail the download on non-2xx responses, on a range request answered with
a full 200, and on video/* content, with localized reasons, instead of
writing the response body to disk
- Save AAC as .m4a
- Tests for request overrides, manifest exclusion and cache isolation
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