Add support for ignored nodes and returning a weight #59

Job	Run time
build_dist (ubuntu-latest, cp310-manylinux_x86_64)	3m 17s
build_dist (ubuntu-latest, cp311-manylinux_x86_64)	3m 1s
build_bazel	2m 19s
build_clang	5m 33s
build_dist (ubuntu-latest, cp312-manylinux_x86_64)	3m 7s
build_sdist	6s
build_dist (macos-latest, cp310-macosx_x86_64, x86_64)	3m 26s
build_dist (macos-latest, cp311-macosx_x86_64, x86_64)	4m 17s
check_sdist_installs	1m 44s
run_main	1m 39s
perf	1m 59s
build_dist (macos-latest, cp312-macosx_x86_64, x86_64)	4m 16s
test	2m 24s
build_dist (macos-latest, cp310-macosx_arm64, arm64)	3m 17s
test_generated_docs_are_fresh	3m 38s
build_dist (macos-latest, cp311-macosx_arm64, arm64)	2m 36s
test_o3	2m 14s
build_dist (macos-latest, cp312-macosx_arm64, arm64)	3m 4s
test_pybind	2m 3s
test_generated_file_lists_are_fresh	3s
upload_dev_release_to_pypi	0s
merge_upload_artifacts	0s
	54m 3s

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