CI/CD

Use `field_index` over `i` for readability #337

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Run time

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Job	Run time
test-py2	26s
test-32bits	41s
test-py3 (3.8)	25s
test-py3 (3.9)	21s
test-py3 (3.10)	29s
test-py3 (3.11)	23s
test-py3 (3.12)	22s
test-py3 (3.13)	30s
	3m 37s