Bugfix: Warn when upcast drops nullness via FindUniqueFeasibleSupertype#18261

abonie merged 4 commits into

maindotnet/fsharp:mainfrom

18232-nullness-issue---typenullinterface-subsumption-in-function-return-values-can-bypass-nullnessdotnet/fsharp:18232-nullness-issue---typenullinterface-subsumption-in-function-return-values-can-bypass-nullnessCopy head branch name to clipboard