feat: Allow nullable expiry per 0.9.0 spec. Fixes #23#95

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cdata merged 1 commit intoucan-wg:mainfrom jsantell:0.9.0-nullable-expiry

Jun 6, 2023

+102-30

Commits on Jun 6, 2023

feat: Allow nullable expiry, per 0.9.0 spec. Fixes ucan-wg#23
jsantell
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