Mutable config #24

Job	Run time
Static analysis (8.2)	14s
Codestyle check on PHP 8.2	13s
Tests (highest, 8.2, false)	14s
Tests (highest, 8.3, false)	13s
Tests (lowest, 8.3, false)	14s
Tests (lowest, 8.2, false)	11s
Tests (8.4, true, highest, --ignore-platform-reqs)	14s
	1m 33s

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