[podsnap]

Yes, lens-aeson looks pretty damn close. I've got a bunch of reading to do.

The existence of zipper lenses catches me by surprise, as I have been frequently directed at a stackoverflow [0] response on the difference between the two...

[0] http://stackoverflow.com/questions/22094971/what-are-the-dif...

[tel]

I'm the author of the non-accepted answer to that question. For what it's worth, I think cgrand's is weak in describing both zippers and lenses, but ultimately lands on the wrong distinction.