Fix import-only files for Node importers (#919)
Cache separate canonical URLs for @use and @import (#908)
The cache for canonical URLs is now keyed on *both* the rule URL and
whether that URL was canonicalized for an `@import` rule.
Revert "Adds built-in clamp() and hypot() (#906)"
This reverts commit 24f84e2.
Revert "Add built-in variables e and pi. (#907)"
This reverts commit 2cb69e7.