ROB: Tolerate "truncated" xref #4605

Job	Run time
Check code style issues	1m 5s
pytest on windows	4m 46s
Build & verify package	17s
pytest on 3.7 (crypto-lib: cryptography)	3m 40s
pytest on 3.8 (crypto-lib: cryptography)	3m 54s
pytest on 3.9 (crypto-lib: cryptography)	3m 41s
pytest on 3.10 (crypto-lib: cryptography)	3m 56s
pytest on 3.11 (crypto-lib: cryptography)	3m 30s
pytest on 3.12 (crypto-lib: cryptography)	5m 21s
pytest on 3.7 (crypto-lib: pycryptodome)	3m 32s
pytest on 3.7 (crypto-lib: none)	3m 40s
Combine & check coverage.	26s
	37m 48s

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