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Prepare Loader and MemoryLoader for TOML support #3995

Job	Run time
tox env type on ubuntu-latest	42s
test 3.13 on ubuntu-latest	4m 48s
tox env type on windows-latest	1m 25s
test 3.13 on windows-latest	16m 6s
tox env dev on ubuntu-latest	31s
test 3.13 on macos-latest	4m 56s
tox env dev on windows-latest	1m 10s
test 3.12 on ubuntu-latest	4m 24s
tox env docs on ubuntu-latest	2m 41s
tox env pkg_meta on ubuntu-latest	20s
test 3.12 on windows-latest	9m 18s
test 3.12 on macos-latest	4m 51s
test 3.11 on ubuntu-latest	3m 8s
test 3.11 on windows-latest	14m 8s
test 3.11 on macos-latest	4m 0s
test 3.10 on ubuntu-latest	3m 22s
test 3.10 on windows-latest	14m 44s
test 3.10 on macos-latest	3m 56s
test 3.9 on ubuntu-latest	3m 20s
test 3.9 on windows-latest	14m 0s
test 3.9 on macos-latest	4m 26s
test 3.8 on ubuntu-latest	3m 19s
test 3.8 on windows-latest	8m 38s
test 3.8 on macos-latest	4m 35s
	2h 12m 48s

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