Merge pull request #1017 from COMBINE-lab/fix/unimem-merge-diagonal #141

Job	Run time
build-test (ubuntu-22.04, linux-x86_64)	7m 54s
build-test (macos-14, macos-arm64)	6m 56s
build-test (macos-15-intel, macos-x86_64)	16m 51s
build-test (ubuntu-24.04-arm, linux-aarch64)	6m 41s
	38m 22s

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