Looking for feedback on an upcoming winnow API change

[epage]

When developing winnow, I found that certain behavior had a dramatic performance impact (e.g. using Located). My theory on the root cause was that the slowdown is because of how much bigger the return type of parsers gets. winnow-rs/winnow#268 tries to change the API to allow people to reduce the size of their return types. In that PR, I've made comments on the code that highlight what the impact of this change is.

This is a major change going from a pure-functional API to more imperative (while still allowing a mostly declarative use). It allows for a new class of bugs but prevents a different class.

What I'm wanting to understand is what users of winnow think of this API, ranging from "its good" to "if the gains are there" to "I'd drop winnow.