A way to control how many older versions of the page created by boost are kept on the server? (Old html and html.gz files)

Server on windows? what's your file system?

Code in question; looks like I need to handle rename failures better.

/**
 * Writes data to filename in an atomic operation thats compatible with older
 * versions of php (php < 5.2.4 file_put_contents() doesn't lock correctly).
 *
 * @param $filename
 *   Name of file to be written
 * @param $buffer
 *   Contents of file
 */
function boost_cache_write($filename, $buffer) {
  $filenames = boost_get_all_filenames($filename);
  foreach ($filenames as $key => $values) {
    if ($key == 'gzip') {
      $data = gzencode($buffer, 9);
    }
    else {
      $data = $buffer;
    }
    foreach ($values as $filename) {
      if (!_boost_mkdir_p(dirname($filename))) {
        if (BOOST_VERBOSE >= 3) {
          watchdog('boost', 'Unable to create directory: %dir<br /> Group ID: %gid<br /> User ID: %uid<br /> Current script owner: %user<br />', array('%dir' => dirname($filename), '%gid' => getmygid(), '%uid' => getmyuid(), '%user' => get_current_user()), WATCHDOG_WARNING);
        }
      }
      $tempfile = $filename . getmypid();
      if (@file_put_contents($tempfile, $data) === FALSE) {
        if (BOOST_VERBOSE >= 3) {
          watchdog('boost', 'Unable to write temp file: %file<br /> Group ID: %gid<br /> User ID: %uid<br /> Current script owner: %user<br />', array('%file' => $tempfile, '%gid' => getmygid(), '%uid' => getmyuid(), '%user' => get_current_user()), WATCHDOG_WARNING);
        }
        return FALSE;
      }
      else {
        if (is_numeric(BOOST_PERMISSIONS_FILE)) {
          @chmod($tempfile, octdec(BOOST_PERMISSIONS_FILE));
        }
        // Erase old file
        if (BOOST_OVERWRITE_FILE) {
          @rename($filename, $tempfile . 'old');
        }
        // Put temp file in its final location
        if (@rename($tempfile, $filename) === FALSE) {
          @unlink($tempfile);
          @rename($tempfile . 'old', $filename);
          if (BOOST_VERBOSE >= 5) {
            watchdog('boost', 'Unable to rename file: %temp  to  %file<br /> Group ID: %gid<br /> User ID: %uid<br /> Current script owner: %user<br />', array('%temp' => $tempfile, '%file' => $filename, '%gid' => getmygid(), '%uid' => getmyuid(), '%user' => get_current_user()), WATCHDOG_WARNING);
          }
          return FALSE;
        }
        elseif (BOOST_OVERWRITE_FILE) {
          @unlink($tempfile . 'boost');
        }
      }
    }
  }
  return TRUE;
}

committed fix
http://drupalcode.org/viewvc/drupal/contributions/modules/boost/boost.mo...