Improve [0] arbitrary value support (#6259)

* test `text-[0]` instead of `w-[0]`

* update changelog

src/util/dataTypes.js

@@ -81,7 +81,7 @@ let lengthUnits = [
 let lengthUnitsPattern = `(?:${lengthUnits.join('|')})`
 export function length(value) {
   return (
-    value === 0 ||
+    value === '0' ||
     new RegExp(`${lengthUnitsPattern}$`).test(value) ||
     cssFunctions.some((fn) => new RegExp(`^${fn}\\(.+?${lengthUnitsPattern}`).test(value))
   )