Merge pull request #506 from biojppm/fix/merge_key_order #811

Job	Run time
samples (Debug, ubuntu-20.04)	2m 37s
samples (Release, ubuntu-20.04)	3m 13s
samples (Debug, windows-2019)	2m 27s
samples (Release, windows-2019)	8m 14s
samples (Debug, macos-latest)	1m 25s
samples (Release, macos-latest)	2m 7s
	20m 3s

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