Bitstream filter API fixes #1241

Job	Run time
package-source	25s
package-wheel (macos-latest, arm64)	12m 20s
py-3.9 lib-6.1 ubuntu-latest	5m 32s
package-wheel (macos-latest, x86_64)	40m 31s
package-wheel (ubuntu-latest, aarch64)	2h 43m 23s
py-3.9 lib-6.0 ubuntu-latest	4m 39s
style	20s
package-wheel (ubuntu-latest, i686)	17m 14s
py-pypy3.9 lib-6.1 ubuntu-latest	4m 37s
py-3.9 lib-6.1 windows-latest	4m 32s
package-wheel (ubuntu-latest, x86_64)	17m 52s
py-3.9 lib-6.1 macos-latest	9m 10s
py-3.9 lib-6.0 windows-latest	3m 34s
package-wheel (windows-latest, AMD64)	14m 22s
publish	45s
	4h 59m 16s

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