Description

The precision of the color conversion for UIColor (and perhaps also for NSColor & other platforms) can be improved.

Steps to Reproduce

1. Show UIColorPickerViewController and enter Display P3 Hex Color : #663399
2. Get UIColor object from UIColorPickerViewController & call ToSystemColor on it
3. Print Color as Hex string

Expected Behavior

#663399

Actual Behavior

#653299

This is because the CGColor has these components:
Red: 101.999986320734
Green: 50.9999969601631
Blue: 153.000021278858

With the current conversion, the values are rounded down:

I think this would be a better conversion method:

return Color.FromArgb((int)Math.Round(alpha * 255), (int)Math.Round(red * 255), (int)Math.Round(green * 255), (int)Math.Round(blue * 255));