Optimise hdf5 #50

Job	Run time
Format + lint code	18s
Format + lint code	18s
Format + lint code	18s
Format + lint code	18s
Format + lint code	18s
Format + lint code	18s
Format + lint code	18s
Run tests for Python 3.8 on ubuntu-latest	1m 50s
Run tests for Python 3.8 on ubuntu-latest	1m 43s
Run tests for Python 3.8 on ubuntu-latest	1m 36s
Run tests for Python 3.8 on ubuntu-latest	1m 43s
Run tests for Python 3.8 on ubuntu-latest	1m 34s
Run tests for Python 3.8 on ubuntu-latest	1m 32s
Run tests for Python 3.8 on ubuntu-latest	1m 35s
Run tests for Python 3.10.4 on ubuntu-latest	4m 27s
Run tests for Python 3.10.4 on ubuntu-latest	1m 45s
Run tests for Python 3.10.4 on ubuntu-latest	1m 46s
Run tests for Python 3.10.4 on ubuntu-latest	3m 7s
Run tests for Python 3.10.4 on ubuntu-latest	1m 50s
Run tests for Python 3.10.4 on ubuntu-latest	1m 44s
Run tests for Python 3.10.4 on ubuntu-latest	2m 10s
	30m 28s

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