I've just published draft #3 of SRFI 153.  It was submitted
by John Cowan, author of the SRFI.

<https://srfi.schemers.org/srfi-153/>

Here are John's comments on the draft:

  This draft of SRFI 153 removes ordered bags.  They may or
  may not be provided by a future SRFI.  In addition,
  oset-pop(!) and oset-pop(!)/reverse have been added, thus
  allowing ordered sets to be used as priority queues.

Here's the diff:

<https://github.com/scheme-requests-for-implementation/srfi-153/compare/9501c5a84af1ffbcd38d85226d79f1974070645c...83f30ed62d6cbdd99718a2310e68d411b6f935ef>

Regards,

SRFI Editor