XForms event xforms-bind-exception should be dispatched when a binding is invalid

The following xf:input(s) have invalid bind

      <xf:input id="i3" bind="b1" >
        <xf:label>invalid bind:</xf:label>
      </xf:input>
      

      <xf:input model="m5" id="i4" ref="name" >
        <xf:label>invalid model:</xf:label>
      </xf:input>