fsprojects / fsprojects/FSharpPlus

Possible undesired seq subsumption results in KeyValuePairs

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question RFC
Dominant language
F#
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Description

This was a question posed here https://github.com/fsprojects/FSharpPlus/issues/288#issuecomment-625480630

Regarding seq and subsumption: Seems it's also happening with tryFind (foldable) and empty (functor). When used for Map<,>, it's subsumed as seq<KeyValuePair<,>> in both cases.

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the linked discussion and the examples involving seq, tryFind, empty, and Map<KeyValuePair<,>>. Determine whether the reported subsumption is intended and identify the expected behavior before choosing any implementation or test location; done requires a resolved, reproducible outcome.

Written by the indexing model from the issue text.

Assessment

Tech stack
fsharp
Domain
compilers
Issue type
Bug
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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