fix panic on `xn--55555577` #620

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Job	Run time
WASM	1m 9s
Test (ubuntu-latest, 1.67.0)	1m 52s
Test (ubuntu-latest, stable)	1m 1s
Test (ubuntu-latest, beta)	59s
Test (ubuntu-latest, nightly)	41s
Audit	17s
Test (macos-latest, stable)	44s
Lint	23s
Test (windows-latest, stable)	2m 22s
Test (windows-latest, nightly)	1m 56s
Result	1s
	11m 25s