I've just published a new draft of SRFI 134 from John Cowan.

  <http://srfi.schemers.org/srfi-134/>

Here are John's notes on this draft:

  All the procedures except ideque=, ideque-append, and
  ideque-zip now accept at most one ideque.  I have verified
  this SRFI against SRFI 1: the linear-update procedures are
  unnecessary, as are the alist and set procedures.  The
  only possible additions would be ideque-concatenate (which
  I think is not necessary in modern Schemes),
  ideque-reverse-append (which is a trivial composition of
  ideque-reverse and ideque-append), ideque-delete (which is
  a trivial variant of ideque-remove), and
  ideque-delete-duplicates, which I have added to the spec.

  I hope to release the implementation and updated tests
  soon.  Other than editorial problems, I don't expect to
  make further changes to the spec.

Regards,

SRFI Editor