docs: def engineering(value, precision=3, prefix=False, prefixes=SI):
      """ Convert a number to engineering notation. """
  
      display = decimal.Context(prec=precision)
      value = decimal.Decimal(value).normalize(context=display)
      string = value.to_eng_string()
  
      if prefix:
          prefixes = {e(exponent): prefix for exponent, prefix in prefixes.items()}
          return replace(string, prefixes)
      else:
          return string