replacer = function( key,value ) { // Exclude these keys from stringification
    const exKeys = ['imp', 'warnings', 'computed', 'filt', 'ctrl', 'index',
      'safe', 'result', 'isModified', 'htmlPreview', 'display_progress_bar'];
    if (_.some( exKeys, val => key.trim() === val)) {
    return undefined; } else { return value; }
  }
Convert the supplied FreshResume to a JSON string, sanitizing meta-properties
along the way.