Tests

Detect more possibly-impossible offset #21769

Job	Run time
Integration tests (ubuntu-latest)	43s
Determine levels tests matrix	32s
Integration tests (windows-latest)	30s
Tests (8.2, ubuntu-latest)	41s
Tests (8.2, windows-latest)	31s
Tests (8.3, windows-latest)	29s
Tests with old PHPUnit (7.4, ubuntu-latest)	41s
Tests (8.4, windows-latest)	30s
Tests with old PHPUnit (8.1, ubuntu-latest)	32s
Tests (8.4, ubuntu-latest)	42s
Tests with old PHPUnit (7.4, windows-latest)	30s
Tests with old PHPUnit (8.0, windows-latest)	29s
Tests with old PHPUnit (8.1, windows-latest)	28s
Tests (8.3, ubuntu-latest)	42s
Tests with old PHPUnit (8.0, ubuntu-latest)	31s
Levels tests	1s
	8m 32s

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