case expression returns null instead of fallback
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Description
**mapbox-gl-js version**: 2.9.0
### Question
`case` fallback value works well for `==` condition, but not `>=` if property is not set:
https://observablehq.com/@mourner/mapbox-gl-expression-playground
`null` instead of `#fallback`:
but it works for `==`:
Can't find where this behaviour is documented: https://docs.mapbox.com/mapbox-gl-js/style-spec/expressions/
Am I missing something?
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Reproduce the reported case-expression behavior in the linked Observable expression playground, comparing an unset property with the >= and == conditions. Read the style-spec expressions documentation and trace the relevant expression implementation; done means the documented or corrected behavior is covered by a regression test and no longer returns null unexpectedly.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- typescript
- Domain
- frontend, web-dev
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 30/100