Remove the *checked*-attribute of all input elements with
        a *name*-attribute given by ``name``.

def uncheck_all(self, name):
        """Remove the *checked*-attribute of all input elements with
        a *name*-attribute given by ``name``.
        """
        for option in self.form.find_all("input", {"name": name}):
            if "checked" in option.attrs:
                del option.attrs["checked"]