Pass boolean value in shortcode

In WordPress shortcodes, how can I pass boolean attributes?
Both of [shortcode boolean_attribute="true"] or [shortcode boolean_attribute=true] are giving string values.

EDIT

There would be no problem for users who know what they’re doing if I use the trick which was commented by @brasofilo. But some users will get lost if they give an attribute false value and receive true value. So is there any other solution?

Is easy to use 0 and 1 values and then typecasting inside the function:

[shortcode boolean_attribute="1"] or [shortcode boolean_attribute="0"]

but if you want you can also strictly check for 'false' and assign it to boolean, in this way you can also use:

[shortcode boolean_attribute="false"] or [shortcode boolean_attribute="true"]

Then:

add_shortcode( 'shortcode', 'shortcode_cb' );

function shortcode_cb( $atts ) {
  extract( shortcode_atts( array(
    'boolean_attribute' => 1
  ), $atts ) );
  if ( $boolean_attribute === 'false' ) $boolean_attribute = false; // just to be sure...
  $boolean_attribute = (bool) $boolean_attribute;
}