Have values match initial values when all input deleted

Author: moxon6

src/helpers.js

@@ -184,6 +184,7 @@ exports.allowedZero = function(val, char, caretPos, options) {
  */
 exports.formattedToRaw = function(formattedValue, options) {
   if (is.not.string(formattedValue)) return NaN;
+  if (!formattedValue.length) return undefined;
 
   // Number(...) accepts thousands ',' or '' and decimal '.' so we must:
 

test/unit/setRawValue.js

@@ -24,12 +24,12 @@ describe('setRawValue', () => {
         expect(element.rawValue).toBe(undefined);
     });
 
-    it('sets value to empty string and rawValue to 0 when entry is deleted', () => {
+    it('resets back to empty string and undefined when entry is deleted', () => {
         element.setRawValue(100);
         element.setRawValue('');
 
         expect(element.value).toBe('');
-        expect(element.rawValue).toBe(0);
+        expect(element.rawValue).toBe(undefined);
     });
 
 });