docs: function require_global( dependency ) {
      var f = 'require_global()'
        , name = disambiguate( dependency )
      ;
      
      if ( typeof name != 'string' ) return name; // dependency name is the exported value
      
      name = name.split( '/' ).pop();
      
      de&&ug( f, 'name:', name );
      
      // Wish: a 'lazy' option to call factory function only upon first require, unless global
      // This option would be backward compatible because it would be an option
      var exports = modules[ name ] || global[ name ];
      
      exports || fatal( f + ' not found: ' + name );
      
      return exports;
    }