Be specific about Firefox nodes-as-nodelist. Never assume that modern browsers will "get it right".

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

src/core.js

@@ -919,6 +919,10 @@ function isArraylike( obj ) {
 		return false;
 	}
 
+	if ( obj.nodeType === 1 && length ) {
+		return true;
+	}
+
 	return type === "array" || type !== "function" &&
 		( length === 0 ||
 		typeof length === "number" && length > 0 && ( length - 1 ) in obj );

test/unit/core.js

@@ -1141,7 +1141,9 @@ test("jQuery.makeArray", function(){
 
 	equal( jQuery.makeArray(/a/)[0].constructor, RegExp, "Pass makeArray a regex" );
 
-	ok( jQuery.makeArray(document.getElementById("form")).length >= 13, "Pass makeArray a form (treat as elements)" );
+	// Some nodes inherit traits of nodelists
+	ok( jQuery.makeArray(document.getElementById("form")).length >= 13,
+		"Pass makeArray a form (treat as elements)" );
 });
 
 test("jQuery.inArray", function(){