Tests

Minor improvements for truncation #1117

Job	Run time
graalvm-build	5m 37s
unit-test (ubuntu-24.04, 24)	43s
unit-test (windows-latest, 24)	1m 5s
jvm-integration-test (windows-latest, 24)	5m 22s
unit-test (macos-latest, 24)	1m 58s
jvm-integration-test (macos-latest, 24)	5m 39s
jvm-integration-test (ubuntu-24.04, 24)	2m 43s
nix-build	6m 17s
graalvm-integration-test	48s
	30m 12s

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