Require BufRead + Seek bound for decoding #703

Job	Run time
powerpc_cross	1m 10s
rustfmt	12s
feature_check (ubuntu-latest)	23s
build (1.65.0, ubuntu-latest)	2m 29s
feature_check (macos-latest)	23s
test_all (ubuntu-latest)	3m 16s
build (1.65.0, windows-latest)	3m 16s
feature_check (unstable, ubuntu-latest)	23s
test_all (macos-latest)	2m 15s
build (1.65.0, macos-latest)	2m 33s
feature_check (unstable, macos-latest)	24s
build (stable, ubuntu-latest)	15s
feature_check (benchmarks, ubuntu-latest)	26s
build (stable, windows-latest)	45s
feature_check (benchmarks, macos-latest)	24s
build (stable, macos-latest)	16s
build (beta, ubuntu-latest)	17s
build (beta, windows-latest)	38s
build (beta, macos-latest)	16s
build (nightly, ubuntu-latest)	15s
build (nightly, windows-latest)	38s
build (nightly, macos-latest)	15s
	21m 9s

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