I've updated the srfi at http://sgmiller.org/code/srfi-44.html.
Editors, please do not update the official draft.  This is a working
copy which addresses most of the issues so far.  The major changes are
collapsing !! to !, removing the reversible attribute (for now), adding
a limitedness attribute for limited collections (rather than limited
sequences only).  And clarifications related to folding and equivalence.

Vectors and strings are also purely mutable now.

	Scott

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