has test should return a boolean 
has test should return a boolean 

so has('xhr-sendAsBinary') won't fail the second time it's called


git-svn-id: ee6e786acc44c9cca5ee17c71a5576c45c210361@26697 560b804f-0ae3-0310-86f3-f6aa0a117693

redaktor/deliteful