nl_tokens: Extracts a boolean from the beginning or ending of an array depending on startOrEndBln .
pl_tokens: function extractBoolFromArray ( array , startOrEndBln ) { var extractedValue = extractFromArrayAt ( array , startOrEndBln ? 0 : <mask> . length - 1 , _Boolean , false ) [ 0 ] ; return isBoolean ( extractedValue ) ? extractedValue : false ; }