>
> But I don't agree at all with the claim that Specter is some sort of 
> offbeat, ill-researched version of lenses.
>

Since you're responding to me specifically, I'd like to be clear that I 
never made that claim. I only said we need more experimentation. This is a 
sufficiently big enough area of ideas to warrant exploration of competing 
approaches.

Specter's navigators can do more than lenses.


I can't speak for anybody else, but when I say "lenses", I'm referring to 
the full range of constructs offered by Edward Kmett's lenses package for 
Haskell. See the stunningly confusing diagram in the docs: 
https://hackage.haskell.org/package/lens - This includes "traversals" and 
"folds" which allow richer transformations than a one-to-one "lens" 
mapping, like the navigators concept in specter.

Specter wouldn't have such richness of functionality and pragmatic 
> performance considerations
>

As I've said on Twitter, Nathan has done an absolutely wonderful job with 
both static (compilation) and dynamic (caching) optimization techniques in 
Specter. The Haskell lenses library gets a lot of the former from existing 
GHC wizardry, but the I'm not sure about the latter, since I'm not 
sophisticated enough with Haskell to tell.

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