(PY) clarify compressor mode parameter values #881

Job	Run time
Build and test cmake:gcc9	30s
Build and test cmake:clang15	37s
Build and test cmake:clang15:asan	52s
Build and test cmake:clang15:tsan	47s
Build and test cmake:clang15:ubsan	58s
Build and test cmake:qemu-arm-neon-gcc	59s
Build and test cmake-osx:clang	23s
Build and test cmake-osx:gcc	22s
Build and test cmake-win64:msvc-rel	1m 22s
Build and test cmake-win64:msvc-dbg	1m 31s
Build and test fuzz:clang15	27s
Build and test python3.10:clang15	1m 45s
Build and test python3.10-win	53s
Build and test maven	29s
Build and test bazel:root	35s
Build and test bazel:go	1m 6s
Build and test bazel:java	2m 9s
Build and test bazel:research	24s
Build and test bazel-osx:root	56s
Build and test bazel-osx:go	1m 39s
Build and test bazel-osx:java	2m 30s
Build and test bazel-osx:research	59s
Build and test bazel-win:root	1m 49s
Build and test bazel-win:java	3m 40s
Build and test bazel-win:research	1m 29s
	29m 11s

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