NumericUpDown control

[dashenxian]

Describe the bug
When the NumericUpDown control is at a value of 5.6 and Increment is 0.01, if adjusted up, it will appear as 0.570000000000000001 instead of 0.57

Code
<NumericUpDown Value="0.56" Minimum="0" Maximum="10" Increment="0.01"/>

Expected behavior
The value should beThe value should be 0.57

Screenshots

Desktop (please complete the following information):

• OS: win 10
• Version 0.9.12

[dashenxian]

I know this is an error in floating-point calculations

[Takoooooo]

value is double, should we consider making it decimal?
For example, in System.Windows.Forms, its done in the way suggested above
https://docs.microsoft.com/en-us/dotnet/api/system.windows.forms.numericupdown.value?view=net-5.0

[Takoooooo]

I suggest adding up-for-grabs label because the solution to this issue seems pretty easy to me

[pr8x]

I think we should port NumericUpDown.DecimalPlaces from WPF to correctly round the values: https://docs.microsoft.com/en-us/dotnet/api/system.windows.forms.numericupdown.decimalplaces?view=net-5.0

[sn4k3]

Related: #4756
To fix this i'm using FormatString="{}{0:0.00}"