docs: def digest(data, func):
      """Hash the given `data` into a new `Multihash`.
  
      The given hash function `func` is used to perform the hashing.  It must be
      a registered hash function (see `FuncReg`).
  
      >>> data = b'foo'
      >>> mh = digest(data, Func.sha1)
      >>> mh.encode('base64')
      b'ERQL7se16j8P28ldDdR/PFvCddqKMw=='
      """
      digest = _do_digest(data, func)
      return Multihash(func, digest)