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totally separate question - can you define a Lens with add'l function or post-processing? example: `val myLens = Query.nonEmptyString().required("ids")...split(";")`  Within the route I can insert the request then add functions: `myLens(myRequest).split(";")` but is it possible to add the `split` to the Lens definition?

Yes, you can use `.map` for that:

```    val lens =  Query.nonEmptyString().map { it.split(";") }.required("ids")
    println(lens(Request(GET, "").query("ids", "a;b;c")))```