NumberBox and Decimals

[tkillingerAlro]

Describe the bug

Certain values cause rounding errors when the control is unfocused.
Examples of values that cause this behavior.
25.8, .0001, 294.1, 2924.8

WinUI.3.Gallery.2023-08-15.08-30-21.mp4

Steps to reproduce the bug

1. Open up the WinUI 3 Gallery that is available on the Microsoft Store
2. Navigate to numberbox
3. Enter 25.8 and focus on another control

Expected behavior

Numbers do not change and stay the same.

Screenshots

No response

NuGet package version

Windows App SDK 1.3.2: 1.3.230602002

Packaging type

No response

Windows version

No response

IDE

No response

Additional context

This seems to be across multiple versions of the Windows App SDK.

[tkillingerAlro]

Any Update on this?

I can confirm Win UI 2 does not have this issue. Also curious as to why this doesn't have the bug label as I'm sure this is not intended behavior.

[TroelsL]

We also observe this bug. And it renders the NumberBox unusable. We tried looking for workarounds, but (somewhat ironically), using a DecimalFormatter with an IncrementNumberRounder does not seem possible as we are unable to set the Increment to 0.0001. This will throw an exception due the setter throwing an System.ArgumentException: 'The parameter is incorrect.' because somewhere 0.0001 gets converted to 9.9999997473787516E-05, which doesn't match the rules specified here:

https://learn.microsoft.com/en-us/uwp/api/windows.globalization.numberformatting.incrementnumberrounder.increment?view=winrt-22621#windows-globalization-numberformatting-incrementnumberrounder-increment