nl_tokens: Get a string key buffer .
pl_tokens: function <mask> ( obj , vonly ) { var vtype = this . type ( 0 ) , key = ! vonly ? this . getStringBuffer ( obj . key ) : new Buffer ( 0 ) , value = this . getStringBuffer ( obj . value ) ; return Buffer . concat ( [ vtype , key , value ] , vtype . length + key . length + value . length ) }