I was looking through these and one thing that might be worth adding to the analysis is a “fixable in external package” check. As an example, elm/parser's missing deadEndsToString doesn’t use any private information that I can see, so it would be feasible to implement it in a parser-extras or parser-patch library, and share that through the community. I suspect that could be true for most of these that don’t involve bugs in native code or re-implementation of operators.
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