Material-ui: Unable to set default elevation for MuiPaper

[jpodpro]

Setting the default elevation for MuiPaper in the theme using the documented method does not work. I can set other default properties of MuiPaper and they do work.

• [x] The issue is present in the latest release.
• [x] I have searched the issues of this repository and believe that this is not a duplicate. However i did find a relevant issue and commented on it but it was marked as off-topic.

Steps to Reproduce 🕹

const theme = createMuiTheme({
  props: {
    MuiPaper: {
      elevation: 10,
      square: true
    }
  }
});

https://codesandbox.io/s/fancy-bird-ekr8b?fontsize=14&hidenavigation=1&theme=dark

Your Environment 🌎

| Tech | Version |
| ----------- | ------- |
| Material-UI | v4.8.3 |
| React |16.11.0|
| Browser |Chrome 78|
| TypeScript |no|

[KyruCabading]

@jpodpro Not sure if this will help you but Card uses a different default prop for elevation than Paper.

Try adding this:

    MuiCard: {
      elevation: 0
    }

If you look at Card.js They set the elevation based on a raised prop. So that's why you need to directly add an elevation to Card itself to override that.

https://github.com/mui-org/material-ui/blob/master/packages/material-ui/src/Card/Card.js#L20

[jpodpro]

@KyruCabading thanks