Thanks for the PR,@bradzacher!

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Codecov Report

Merging#1694 intomaster willdecrease coverage by0.22%.
The diff coverage is80.31%.

@@            Coverage Diff             @@##           master    #1694      +/-   ##==========================================- Coverage   94.64%   94.42%   -0.23%==========================================  Files         160      161       +1       Lines        7263     7386     +123       Branches     2081     2117      +36     ==========================================+ Hits         6874     6974     +100- Misses        167      180      +13- Partials      222      232      +10

Is there anything blocking this? Been trying out the otherno-unsafe-* rules (they caught real bugs!) and been missing this case

There's nothing blocking it any more. I was going to add an option to prevent "evolving" types, but I decided against that for now (I think it deserves to live as its own rule).

With the CI passing, I'll merge this now.