nl_tokens: Removes a value from the map for an associated key .
pl_tokens: function ( key ) { // don't use ES6 "delete" because it will be annoying // to use in browsers that are not ES6 friendly; var keys = this . keys , values = this . values , guid = guidFor ( key ) ; if ( values . hasOwnProperty ( guid ) ) { keys . remove ( key ) ; delete values [ guid ] ; <mask> ( this , 'length' , keys . list . length ) ; return true ; } else { return false ; } }