Editorial: Fix some type assertions #3167
                
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A group at the University of Bergen has done some work using an automated proof assistant on the type assertions in the spec text, and brought several issues to my attention. This PR fixes those issues.
The proof code is available at https://github.com/bldl/temporal-rocq
I recommend reviewing each commit separately.
Summary of the changes:
Thank you to @voiestad and @aria-eide.