fix: wildcard was matching unconditionally

README.md

@@ -6,7 +6,7 @@
 <img src='https://bettercodehub.com/edge/badge/MikeIbberson/comparisons?branch=master'>
 </p> 
 
-<p>Currently, expressions support <code>=</code>, <code>>=</code>, <code><=</code>, <code>></code> and <code><</code> operators. Optionally, you can include a second constructor argument for changing the locale (the default is "en"). Any expressions that do not match a recognized operation get stripped out and are assumed to pass. For simply matching on exists, use the <code>=*</code> expression.</p>
+<p>Currently, expressions support <code>=</code>, <code>>=</code>, <code><=</code>, <code>></code> and <code><</code> operators. Optionally, you can include a second constructor argument for changing the locale (the default is "en"). Any expressions that do not match a recognized operation get stripped out and are assumed to pass. For simply matching if a property exists, use the <code>=*</code> expression.</p>
 
 <p>Don't worry about type casting&mdash;we'll handle that for you.</p>
 

lib/__tests__/utils.test.js

@@ -30,6 +30,12 @@ describe('Utils', () => {
 
     it('should return falsy on numeric mismatch', () =>
       expect(Utils.equals('12', 123)).toBeFalsy());
+
+    it('should return falsy on empty', () =>
+      expect(Utils.equals('', '*')).toBeFalsy());
+
+    it('should return truthy on wildcard', () =>
+      expect(Utils.equals('a', '*')).toBeTruthy());
   });
 
   describe('isGreaterThan', () => {

lib/utils.js

@@ -59,7 +59,8 @@ class ValidatorRunner {
 }
 
 const equals = (a, b, locale) => {
-  if (b === '*') return true;
+  if (b === '*') return a !== '' && a !== undefined && a !== null;
+
   return (
     String(a).localeCompare(String(b), locale, {
       sensitivity: 'base',