The voice-region truncation survived every test because there was nothing to
catch: the region parsed, the chunks decoded, the durations were self-consistent.
A missing third of a stream is smaller VALID output, and no check written against
our own output distinguishes that from correct output. What caught it was a
number from outside -- the running decoder's byte_sizes not fitting the region.
So: prefer at least one test per decoder pinned to something we did not produce,
and say so in the test, because the obvious maintenance of such a test is to
re-baseline it against current output, which deletes the only thing it was for.
Plus the port's corollary: it was checkable only because the identifier happened
to be a byte count. Index a handed-over result by a quantity the recipient can
test.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v
b0c957bbf3