tests

Fix int node serialization tests #519

Job	Run time
Tests (8.1, ubuntu-latest, prefer-lowest)	22s
Tests (8.1, ubuntu-latest, prefer-stable)	16s
Tests (8.1, macos-latest, prefer-lowest)	1m 22s
Tests (8.1, macos-latest, prefer-stable)	1m 24s
Tests (8.1, windows-latest, prefer-lowest)	41s
Tests (8.1, windows-latest, prefer-stable)	38s
Tests (8.2, ubuntu-latest, prefer-lowest)	22s
Tests (8.2, ubuntu-latest, prefer-stable)	16s
Tests (8.2, macos-latest, prefer-lowest)	1m 23s
Tests (8.2, macos-latest, prefer-stable)	1m 20s
Tests (8.2, windows-latest, prefer-lowest)	40s
Tests (8.2, windows-latest, prefer-stable)	37s
Tests (8.3, ubuntu-latest, prefer-lowest)	16s
Tests (8.3, ubuntu-latest, prefer-stable)	14s
Tests (8.3, macos-latest, prefer-lowest)	1m 36s
Tests (8.3, macos-latest, prefer-stable)	1m 16s
Tests (8.3, windows-latest, prefer-lowest)	38s
Tests (8.3, windows-latest, prefer-stable)	47s
	14m 8s

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