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193fc60989
This PR fixes an issue where we didn't always correctly validated
invalid CSS variables when using the CSS variable shorthand syntax.
This PR fixes that by ensuring we start with `--`. We can't validate
that the variable exists at runtime, but we can validate if it looks
like a valid CSS variable.
We can go a step further by validating if the CSS variable is valid
syntax (e.g.: all characters are valid), but we can introduce this if
this is causing actual issues in projects.
```
p-(a-b)
```
Used to compile to:
```css
.p-\(a-b\) {
padding: var(a-b);
}
```
But not anymore.