Serialization doesn't roundtrip #177
Description
I noticed a problem with iso-ucan interop specifically copying this example from ucan inspector
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In the inspector you can see notice "cmd": "/debug/echo" but if I decode with rs-ucan and then serialize it back I get slightly different output and specifically cmd seems to have trailing slash "cmd": "/debug/echo/" which causes problems. Here is the serialized version from rs-ucan
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