Bitstream filter API fixes #1242

Job	Run time
package-source	25s
py-3.9 lib-6.1 ubuntu-latest	5m 21s
package-wheel (macos-latest, arm64)	20m 35s
style	20s
py-3.9 lib-6.0 ubuntu-latest	4m 27s
package-wheel (macos-latest, x86_64)	34m 29s
py-pypy3.9 lib-6.1 ubuntu-latest	4m 43s
package-wheel (ubuntu-latest, aarch64)	2h 44m 17s
py-3.9 lib-6.1 windows-latest	4m 0s
py-3.9 lib-6.1 macos-latest	9m 18s
package-wheel (ubuntu-latest, i686)	17m 8s
py-3.9 lib-6.0 windows-latest	3m 29s
package-wheel (ubuntu-latest, x86_64)	16m 58s
package-wheel (windows-latest, AMD64)	14m 3s
publish	56s
	5h 0m 29s

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