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Add canonical Map arrays and builder #6991

Job	Run time
Rust publish dry-run	22s
check-java-publish-build (aarch64-unknown-linux-gnu, runs-on=30920903985/runner=arm64-medium/imag...	2m 18s
Python (wheel build)	5m 47s
Compat check / compat-test	3m 44s
check-java-publish-build (x86_64-unknown-linux-gnu, runs-on=30920903985/runner=amd64-medium/image...	1m 20s
	13m 31s