code: function dropLeadingSlashes( str ){
          if( typeof(str) !== "string" ) throw TypeError( "Arg 'str' of unexpected type. Expected 'string' but got '"+typeof(str)+"'." );
          var start;
          for( start=0 ; str[start]==='/' ; ++start );
          str = str.substr( start );
          return str;
      }
docs: <p>Filter, removing all leading slashes from given string.</p>
  @param str {String}
  String where to remove all leading slashes.
  @return {String}
  Specified string but without any leading slashes.