leanprover-community / leanprover-community/mathlib4

Feature Request: Default list

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Description

See #7322. It would be nice if the ListBlank API were generalized to allow specifying any value as the default.

Contributor guide

Open the contributing guide

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 by reading the ListBlank API and the context in issue #7322. Determine how the current blank-list default is represented and how an arbitrary default should be exposed. Done means the API supports specifying any default value, with coverage for the existing behavior and the new use case.

Written by the indexing model from the issue text.

Assessment

Domain
api
Issue type
Feature
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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