This is an auto-filled bug because dev-python/cbor fails tests. The issue was originally discovered on arm64, but it may be reproducible on other arches as well. If you think that a different summary clarifies the issue better, feel free to change it. Attached build log and emerge --info.
Created attachment 634704 [details] build.log build log and emerge --info
Fixed in cbor-1.0.0-r1