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Restrict over', iover', and set' to traversals #475

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Restrict over', iover', and set' to traversals #475

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Commits on Dec 28, 2022

  1. Switch to Solo from Identity' 

    * The `Identity'` type was non-standard and overly complicated.  The
  `Solo` type, now in `base`, is operationally identical and simpler to
  deal with. Use that instead.

* Remove some surprisingly lazy matches on `Identity'`.
    @treeowl
    treeowl committed Dec 28, 2022
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  2. Restrict over', iover', and set' to traversals 

    * `over'`, `iover'`, `set'`, and associated operators previously
  accepted setters. However, it's impossible to actually modify strictly
  through a setter; a traversal is needed for that. Restrict the types
  to require `A_Traversal`, and remove the associated (technically
  correct but deceptive) `Mapping` instances.

* Document the strictness behavior of `set'`.

Fixes well-typed#473
    @treeowl
    treeowl committed Dec 28, 2022
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