code: function clean(value) {
    if (value === null || value === undefined) {
      return ''
    }
  
    return trim(
      collapse(String(value).replace(/[\u0021-\u0040]+/g, ' '))
    ).toLowerCase()
  }
docs: /* Clean `value`
  Removed general non-important (as in, for language detection) punctuation
  marks, symbols, and numbers.