Do not iterate over functions. Fixes #12665. Unit tests added. Thanks to @kselden for finding the bug.

Author: jaubourg

src/callbacks.js

@@ -93,8 +93,10 @@ jQuery.Callbacks = function( options ) {
 					(function add( args ) {
 						jQuery.each( args, function( _, arg ) {
 							var type = jQuery.type( arg );
-							if ( type === "function" && ( !options.unique || !self.has( arg ) ) ) {
-								list.push( arg );
+							if ( type === "function" ) {
+								if ( !options.unique || !self.has( arg ) ) {
+									list.push( arg );
+								}
 							} else if ( arg && arg.length && type !== "string" ) {
 								// Inspect recursively
 								add( arg );

test/unit/callbacks.js

@@ -12,17 +12,17 @@ var output,
 	outputB = addToOutput( "B" ),
 	outputC = addToOutput( "C" ),
 	tests = {
-		"":                   "XABC   X     XABCABCC  X  XBB X   XABA  X",
-		"once":               "XABC   X     X         X  X   X   XABA  X",
-		"memory":             "XABC   XABC  XABCABCCC XA XBB XB  XABA  XC",
-		"unique":             "XABC   X     XABCA     X  XBB X   XAB   X",
-		"stopOnFalse":        "XABC   X     XABCABCC  X  XBB X   XA    X",
-		"once memory":        "XABC   XABC  X         XA X   XA  XABA  XC",
-		"once unique":        "XABC   X     X         X  X   X   XAB   X",
-		"once stopOnFalse":   "XABC   X     X         X  X   X   XA    X",
-		"memory unique":      "XABC   XA    XABCA     XA XBB XB  XAB   XC",
-		"memory stopOnFalse": "XABC   XABC  XABCABCCC XA XBB XB  XA    X",
-		"unique stopOnFalse": "XABC   X     XABCA     X  XBB X   XA    X"
+		"":                   "XABC   X     XABCABCC  X  XBB X   XABA  X   XX",
+		"once":               "XABC   X     X         X  X   X   XABA  X   XX",
+		"memory":             "XABC   XABC  XABCABCCC XA XBB XB  XABA  XC  XX",
+		"unique":             "XABC   X     XABCA     X  XBB X   XAB   X   X",
+		"stopOnFalse":        "XABC   X     XABCABCC  X  XBB X   XA    X   XX",
+		"once memory":        "XABC   XABC  X         XA X   XA  XABA  XC  XX",
+		"once unique":        "XABC   X     X         X  X   X   XAB   X   X",
+		"once stopOnFalse":   "XABC   X     X         X  X   X   XA    X   XX",
+		"memory unique":      "XABC   XA    XABCA     XA XBB XB  XAB   XC  X",
+		"memory stopOnFalse": "XABC   XABC  XABCABCCC XA XBB XB  XA    X   XX",
+		"unique stopOnFalse": "XABC   X     XABCA     X  XBB X   XA    X   X"
 	},
 	filters = {
 		"no filter": undefined,
@@ -32,7 +32,7 @@ var output,
 			};
 		}
 	};
-
+	
 	function showFlags( flags ) {
 		if ( typeof flags === "string" ) {
 			return '"' + flags + '"';
@@ -60,7 +60,7 @@ jQuery.each( tests, function( strFlags, resultString ) {
 
 				test( "jQuery.Callbacks( " + showFlags( flags ) + " ) - " + filterLabel, function() {
 
-					expect( 20 );
+					expect( 21 );
 
 					// Give qunit a little breathing room
 					stop();
@@ -197,6 +197,19 @@ jQuery.each( tests, function( strFlags, resultString ) {
 					cblist.add( outputC );
 					strictEqual( output, results.shift(), "Adding a callback after one returned false" );
 
+					// Callbacks are not iterated
+					output = "";
+					function handler( tmp ) {
+						output += "X";
+					}
+					handler.method = function() {
+						output += "!";
+					};
+					cblist = jQuery.Callbacks( flags );
+					cblist.add( handler );
+					cblist.add( handler );
+					cblist.fire();
+					strictEqual( output, results.shift(), "No callback iteration" );
 				});
 			});
 		});