You can avoid GC in hot loops in F# with value-types, explicit inlining, and mutability. Mutability may not result in very idiomatic code however, although it

You can avoid GC in hot loops in F# with value-types, explicit inlining, and mutability. Mutability may not result in very idiomatic code however, although it can often be wrapped with a functional API (e.g. parser combinators).