do not stringify the payload when signing async - closes #224

sign.js

@@ -127,10 +127,9 @@ module.exports = function (payload, secretOrPrivateKey, options, callback) {
     jws.createSign({
       header: header,
       privateKey: secretOrPrivateKey,
-      payload: JSON.stringify(payload),
+      payload: payload,
       encoding: encoding
-    })
-      .once('error', callback)
+    }).once('error', callback)
       .once('done', function (signature) {
         callback(null, signature);
       });

test/async_sign.tests.js

@@ -1,5 +1,6 @@
 var jwt = require('../index');
 var expect = require('chai').expect;
+var jws = require('jws');
 
 describe('signing a token asynchronously', function() {
 
@@ -40,5 +41,13 @@ describe('signing a token asynchronously', function() {
         done();
       });
     });
+
+    it('should not stringify the payload', function (done) {
+      jwt.sign('string', 'secret', {}, function (err, token) {
+        if (err) { return done(err); }
+        expect(jws.decode(token).payload).to.equal('string');
+        done();
+      });
+    });
   });
 });