jQuery selector: inputs that have fallen back to type="text"

selector.js

/*
 * $( 'input[type=datetime]' ) selects the inputs regardless
 * of the browsers understanding, as does the equivlent CSS
 *
 * The custom selectors below select the inputs based on the
 * fallback, rather than the attribute
 *
 * USE
 * $( 'input:textprop' ); // select inputs displaying as type=text
 * $( 'input:nottextprop' ); // select inputs not displaying as type=text
 */
jQuery.extend(jQuery.expr[':'],{
    textprop: function(el) {
        return jQuery(el).prop('type') === 'text';
    },
    nottextprop: function(el) {
        return jQuery(el).prop('type') !== 'text';
    }
    // be nice to add something here that detected 
    // only HTML5 inputs that had fallen back
});

These are probably not very efficient.