Regression in 3.7.1 in calculating label floats compared to 2.9.3

[hartator]

Expected behavior

Before in 2.9.3:

Current behavior

Same code and same data in 3.7.1:

Reproducible sample

https://serpapi.com/status

Optional extra steps/info to reproduce

https://serpapi.com/status is still on 2.9.3 but you can upgrade the Chart.js then re-run the graph.

Possible solution

No response

Context

No response

chart.js version

v3.7.1

Browser name and version

Chrome latest

Link to your project

https://serpapi.com/

[LeeLenaleee]

Can you add a reproducable sample with the template provided in the issue template. Since I dont see any way in the site you linked to switch between V3 and V2

[etimberg]

I'm guessing this is coming from the formatter that's been added to add the % symbol. See https://jsfiddle.net/5n312Laf/1/ as an example. if the callback is removed, the labels show with the proper precision.

It probably makes sense to have the callback call the default and append the % sign. The default formatter is https://github.com/chartjs/Chart.js/blob/master/src/core/core.ticks.js#L28-L54.

Example calling the internal formatter first: https://jsfiddle.net/uvwf3zkg/