Serialization context changes in anticipation of Standalone Activity #3471

Job	Run time
test-latest-deps	10m 18s
build-lint-test (3.9, ubuntu-arm)	10m 42s
build-lint-test (3.9, ubuntu-latest)	17m 28s
features-tests / test	7m 46s
build-lint-test (3.13, ubuntu-latest)	11m 32s
build-lint-test (3.13, macos-arm)	8m 58s
build-lint-test (3.9, macos-intel)	17m 18s
build-lint-test (3.9, windows-latest)	13m 52s
build-lint-test (3.13, windows-latest)	19m 19s
build-lint-test (3.13, ubuntu-arm)	10m 56s
build-lint-test (3.13, macos-intel)	20m 1s
build-lint-test (3.9, macos-arm)	9m 4s
	2h 37m 14s

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