Cannot assign text value '4' into property '...' of type UInt32

[sylveon]

Describe the bug It's impossible to declare a uint (in C#) or uint32_t (in C++) dependency property and then use it from XAML.

Steps to reproduce the bug

Steps to reproduce the behavior:

1. Declare a dependency property of type uint in a control or other XAML-enabled thing.
2. Try to assign a value to this property from XAML.

Expected behavior I expected this to work

Screenshots

Version Info

NuGet package version: No NuGet package used

Windows app type:	UWP	Win32
Yes	Yes (system XAML islands)

Windows version	Saw the problem?
Insider Build (xxxxx)
October 2020 Update (19042)	Yes
May 2020 Update (19041)
November 2019 Update (18363)
May 2019 Update (18362)
October 2018 Update (17763)
April 2018 Update (17134)
Fall Creators Update (16299)
Creators Update (15063)

Device form factor	Saw the problem?
Desktop	Yes
Xbox
Surface Hub
IoT

Additional context

[asklar]

CC @RealTommyKlein @evelynwu-msft

[michael-hawker]

This happens with C# UWP as well (pretty sure it's always been like this?):

Would be nice to get some automatic type-safety/value-coercion by being able to limit the type.