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Improve file handling with lazy reads #985

Job	Run time
Run 'mypy' on python 3.x	23s
test-sdist	1m 26s
Run tests on ubuntu-latest, py3.8	36s
Run 'twine-check' on python 3.x	26s
Run tests on ubuntu-latest, py3.9	35s
Run 'py-mindeps' on python 3.8	26s
ensure-catalog-matches-hook-config	20s
Run tests on ubuntu-latest, py3.10	33s
Self-Check	9s
Run tests on ubuntu-latest, py3.11	38s
Run tests on ubuntu-latest, py3.12	44s
Run tests on windows-latest, py3.8	1m 56s
Run tests on windows-latest, py3.9	1m 50s
Run tests on windows-latest, py3.10	1m 32s
Run tests on windows-latest, py3.11	1m 53s
Run tests on windows-latest, py3.12	2m 4s
Run tests on macos-latest, py3.8	1m 44s
Run tests on macos-latest, py3.9	2m 3s
Run tests on macos-latest, py3.10	1m 8s
Run tests on macos-latest, py3.11	1m 57s
Run tests on macos-latest, py3.12	1m 48s
Collate results to check for skipped tests	6s
	24m 17s

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