docs: def from_pairs(cls, doc, pairs):
          """
          Construct an enumeration from an iterable of pairs.
  
          :param doc: See `Enum.__init__`.
          :type pairs: ``Iterable[Tuple[unicode, unicode]]``
          :param pairs: Iterable to construct the enumeration from.
          :rtype: Enum
          """
          values = (EnumItem(value, desc) for value, desc in pairs)
          return cls(doc=doc, values=values)