build

merge: prep for changing internal representation of `Merge` values #7702

Job	Run time
Check protos	41s
build (ubuntu-latest)	4m 32s
Check formatting	17s
build (macos-13)	4m 54s
build (windows-latest)	7m 53s
cargo-deny (advisories)	29s
build (ubuntu-latest, --all-features)	9m 54s
cargo-deny (bans licenses sources)	24s
Clippy check	3m 20s
Check that MkDocs can build the docs	21s
	32m 45s

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