Use unnest for bulk operations in corrosion #1385

Job	Run time
Test (aarch64-apple-darwin, macos-latest)	12m 42s
lint (x86_64-unknown-linux-gnu, ubuntu-24.04)	5m 33s
Test (x86_64-unknown-linux-gnu, ubuntu-latest)	9m 8s
Build book	26s
lint (aarch64-apple-darwin, macos-15)	6m 43s
	34m 32s

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