RAC NumberField: roundingMode in formatOptions not respected when step is provided

[MarekBodingerBA]

Provide a general summary of the issue here

When using roundingMode: 'floor' in formatOptions with a step value in NumberField, the rounding mode is not respected when changing values.

🤔 Expected Behavior?

When roundingMode: 'floor' is specified in formatOptions, the value should be floored according to the specified fraction digits, regardless of whether a step value is provided.

😯 Current Behavior

When a step value is provided (e.g., step={0.01}), the roundingMode: 'floor' setting in formatOptions is not respected when changing values. The value appears to use default rounding behavior instead of flooring.

💁 Possible Solution

The formatOptions and NumberFieldProps (like step) shouldn't interfere with each other. I am aware there might be conflicting options that would be hard to solve, but ideally these two aspects of the component would work independently.

🔦 Context

No response

🖥️ Steps to Reproduce

1. Start with the initial value of 1.236 in both fields
2. Change the value in the first field (with step)
3. Observe that the value doesn't respect the floor rounding mode
4. Compare with the second field (without step) where the rounding mode is respected

CodeSandbox link: https://codesandbox.io/p/sandbox/sleepy-cori-3t8lcx

Version

react-aria-components@1.6.0

What browsers are you seeing the problem on?

Chrome

If other, please specify.

No response

What operating system are you using?

Windows 11

🧢 Your Company/Team

No response

🕷 Tracking Issue

No response

[snowystinger]

If you're going to round/floor it, why allow for a step smaller than what you will round to? I don't quite follow the use case here. Can you provide a concrete example of when you'd do this?

[MarekBodingerBA]

Maybe I'm missing something, but the step is 0.01 and minimumFractionDigits / maximumFractionDigits is 2 which is equal, isn't it? Only the initial value has 3 fraction digits, but it just demonstrates the initial rounding and isn't important for the issue.

[MarekBodingerBA]

Just to be clear what is the issue:

1. Write 1.009 manually to With step={0.01} / With roundingMode: 'floor' and it gets rounded to 1.01 (incorrectly).
2. Write 1.009 manually to Without step / With roundingMode: 'floor' and it gets rounded to 1.00 (correctly).

[snowystinger]

I see, I think this is a duplicate of #6359