Tests

Get rid of `instanceof *Type` checks #23037

Job	Run time
Integration tests (ubuntu-latest)	39s
Integration tests (windows-latest)	30s
Tests with old PHPUnit (7.4, ubuntu-latest)	27s
Determine levels tests matrix	39s
Tests with old PHPUnit (8.0, ubuntu-latest)	27s
Tests with old PHPUnit (7.4, windows-latest)	30s
Tests with old PHPUnit (8.0, windows-latest)	29s
Tests (8.3, ubuntu-latest)	39s
Tests (8.4, ubuntu-latest)	40s
Tests (8.5, ubuntu-latest)	28s
Tests with old PHPUnit (8.1, windows-latest)	31s
Tests (8.3, windows-latest)	30s
Tests (8.2, ubuntu-latest)	28s
Tests with old PHPUnit (8.1, ubuntu-latest)	27s
Tests (8.4, windows-latest)	27s
Tests (8.5, windows-latest)	30s
Tests (8.2, windows-latest)	30s
Levels tests	1s
	8m 52s

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