nl_tokens: marks a character key as held down while recording a sequence
pl_tokens: function _recordKey ( key ) { var i ; // one-off implementation of Array.indexOf, since IE6-9 don't support it for ( i = 0 ; i < _currentRecordedKeys . length ; ++ i ) { if ( _currentRecordedKeys [ i ] === key ) { return ; } } _currentRecordedKeys . push ( <mask> ) ; if ( key . length === 1 ) { _recordedCharacterKey = true ; } }