[development] valid_input_data no more available on 4.6.4

Hi everybody. I just received a bug report on the bug tracking system of my css.module . http://drupal.org/node/40340 As wrote there function valid_input_data has been removed from 4.6.4 . Why does it been removed? What can we use for input checking? filter_xss? I think that this change (and others) should be documented on the handbooks. Thanks. Fabio