convenience: new Pubkey(point)

lib/pubkey.js

@@ -2,11 +2,15 @@ var Point = require('./point');
 var bn = require('./bn');
 var privkey = require('./privkey');
 
-var Pubkey = function Pubkey(obj) {
+var Pubkey = function Pubkey(point) {
   if (!(this instanceof Pubkey))
     return new Pubkey(obj);
-  if (obj)
+  if (point instanceof Point)
+    this.point = point;
+  else if (point) {
+    var obj = point;
     this.set(obj);
+  }
 };
 
 Pubkey.prototype.set = function(obj) {

test/pubkey.js

@@ -17,6 +17,13 @@ describe('Pubkey', function() {
     should.exist(pk.point);
   });
 
+  it('should create a public key with a point with this convenient method', function() {
+    var p = Point();
+    var pk = new Pubkey(p);
+    should.exist(pk.point);
+    pk.point.toString().should.equal(p.toString());
+  });
+
   describe('#set', function() {
     
     it('should make a public key from a point', function() {