fill: 'stack' does not work with stepped lines
Open
type: bug
- Dominant language
- JavaScript
- Stars
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- Forks
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- Avg merge
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- Merged PRs (30d)
- 5
Description
### Expected behavior
It should fill to the STEPPED line below
### Current behavior
It fills to imaginary non-stepped line below:
### Reproducible sample
https://codepen.io/kurkle/pen/mdKNNja
### Optional extra steps/info to reproduce
_No response_
### Possible solution
_No response_
### Context
_No response_
### chart.js version
v4.1.0
### Browser name and version
_No response_
### Link to your project
_No response_
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