docs: def idgen(idbase, tint=None, bits=64):
      '''
      Generate an IRI as a hash of given information, or just make one up if None given
      idbase -- Base URI for generating links
      tint -- String that affects the sequence of IDs generated if sent None
  
      >>> from bibframe.contrib.datachefids import idgen
      >>> g = idgen(None)
      >>> next(g) #Or g.send(None)
      'gKNG1b7eySo'
      >>> next(g)
      'cXx7iv67-3E'
      >>> g.send('spam')
      'OZxOEos8e-k'
      >>> next(g)
      'mCFhsaWQ1_0'
      >>> g.send('spam')
      'OZxOEos8e-k'
      >>> g.send('eggs')
      'xQAd4Guk040'
      >>> g.send('')
      'AAAAAAAAAAA'
      '''
      counter = -1
      to_hash = None
      while True:
          if to_hash is None:
              to_hash = str(counter)
              if tint: to_hash += tint
          to_hash = simple_hashstring(to_hash, bits=bits)
          to_hash = yield iri.absolutize(to_hash, idbase) if idbase else to_hash
          counter += 1