ensure units can be lower and uppercase

Author: RobinMalfait

packages/tailwindcss/src/utils/math-operators.ts

@@ -1,5 +1,7 @@
 const LOWER_A = 0x61
 const LOWER_Z = 0x7a
+const UPPER_A = 0x41
+const UPPER_Z = 0x5a
 const LOWER_E = 0x65
 const UPPER_E = 0x45
 const ZERO = 0x30
@@ -63,7 +65,12 @@ export function addWhitespaceAroundMathOperators(input: string) {
 
     // If we saw a number before, and we see normal a-z character, then we
     // assume this is a value such as `123px`
-    else if (valuePos !== null && ((char >= LOWER_A && char <= LOWER_Z) || char === PERCENT)) {
+    else if (
+      valuePos !== null &&
+      (char === PERCENT ||
+        (char >= LOWER_A && char <= LOWER_Z) ||
+        (char >= UPPER_A && char <= UPPER_Z))
+    ) {
       valuePos = i
     }