better handling of uppercase angle untis

Author: jacobp100

src/tokenTypes.js

@@ -67,7 +67,7 @@ export const AUTO = regExpToken(autoRe)
 export const NUMBER = regExpToken(numberRe, Number)
 export const LENGTH = regExpToken(lengthRe, Number)
 export const UNSUPPORTED_LENGTH_UNIT = regExpToken(unsupportedUnitRe)
-export const ANGLE = regExpToken(angleRe)
+export const ANGLE = regExpToken(angleRe, angle => angle.toLowerCase())
 export const PERCENT = regExpToken(percentRe)
 export const IDENT = regExpToken(identRe)
 export const STRING = matchString

src/transforms/transform.js

@@ -3,7 +3,7 @@ import { SPACE, COMMA, LENGTH, NUMBER, ANGLE } from '../tokenTypes'
 const oneOfType = tokenType => functionStream => {
   const value = functionStream.expect(tokenType)
   functionStream.expectEmpty()
-  return typeof value === 'string' ? value.toLowerCase() : value
+  return value
 }
 
 const singleNumber = oneOfType(NUMBER)