In material-ui/core@v5.0.0-alpha.10 theme.spacing always return string (even for a single parameter).
The typescript definition in createSpacing.d.ts assume that it returns number for less than 2 parameters...

Environment

Vuetify Version: 2.3.10
Vue Version: 2.6.12
Browsers: Chrome 84.0.4147.135
OS: Windows 10

Steps to reproduce

Add a VProgressCircular to your project, change theme to dark.

Expected Behavior

In light theme, both loaded part and unloaded part are visible - have different color from each other and from background color.
Expected the same in dark

Affected documentation page: https://material.angular.io/components/stepper

1. Examples using MatStepperIntl. There's a small mention to it in the overview page, but it'd be better if you put a real example on it. Basically the same request as #8239 (for paginator).
2. StepState is not being shown up in API page. To know what stepState @Input expects we should go deep in code.
3. Ex

Not a single form field has a label. These designs are not usable and the patterns presented should be discouraged.

I suggest adding a validation check like Nu Validator, aXe, lighthouse, etc. to show all the places this markup is invalid.

Is there any way to implement horizontal radio button group?

Is your feature request related to a problem? Please describe.
When setting the layout anchor of a extended fab to the bottom app bar it does not show the cutout.

Describe the solution you'd like
The ability to use any shape as the cutout, or at least all the Fab variants.

Currently the color zone supports setting Primary* values in its Mode property. Currently it only supports a single Accent value. We should add two additional values to ColorZoneMode called AccentLight and AccentDark.

The triggers that set the Background/Foreground for each of the modes are set in the [Generic.xaml](https://github.com/MaterialDesignInXAML/MaterialDesignInXamlToolkit/blo