Fix crash on recursive interrupt ID #534
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This forbids a bit more than could cause a crash, but checking for actual recursion only isn’t that trivial and is more intensive computationally.
Co-authored-by: sfan5 <sfan5@live.de>
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Fix #473.
This ensures the interrupt ID, if it is a table, is a proper tree. A DAG wouldn’t crash the server either but checking for that is tricky.
This also deprecates non-string IIDs to allow future simplifications. Interrupt ID isn’t a place to store tables.