Thanks for the PR, @bradzacher!

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Codecov Report

Merging #1694 into master will decrease coverage by 0.22%.
The diff coverage is 80.31%.

@@            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 other no-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.