> having a slow and stable industry base that favors backwards compatibility, stability and performance I feel as if GHC addresses backwards compatibility and

> having a slow and stable industry base that favors backwards compatibility, stability and performance I feel as if GHC addresses backwards compatibility and stability fairly well with new language features being gated by language pragmas. [1] I don't write much Haskell in production, and what I do write isn't very performance intensive, but GHC's been pretty impressive vs. other compilers with languages at a similar level of abstraction. [1] Foldable/Traversable in Prelude was a relatively large breaking change, and it was handled in a way that minimized the impact to existing code while still advancing the language.