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This PR fixes support for "fallback" values for declarations in plugins.
A plugin using `addUtilities`, `matchUtilities`, `addComponents`, etc…
should be able to specify "fallback" values for declarations by passing
an array as the value of a declaration however this does not currently
work in v4 (but it does in v3):
```js
export default {
plugins: [
function ({ addUtilities }) {
addUtilities({
'.outlined': {
outline: ['1px solid ButtonText', '1px auto -webkit-focus-ring-color'],
},
})
},
],
};
```
After this PR the candidate `outlined` will now produce the following
CSS — like it does in v3:
```css
.outlined {
outline: 1px solid ButtonText;
outline: 1px auto -webkit-focus-ring-color;
}
```
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