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Re: Open issues for SRFI 113

Alex Shinn scripsit:

> We should document whether or not it's an error to
> mutate a set while it is being folded over (I would say
> it's an error).  

Added.  I have also added the analogue of `iset-update!` from
ImmutableDataStructuresWortman under the name of `set-search!`.
The name comes from HashTablesCowan, where `update!` is in use
for something else.

John Cowan <cowan@xxxxxxxx>             http://www.ccil.org/~cowan
Sir, I quite agree with you, but what are we two against so many?
    --George Bernard Shaw,
         to a man booing at the opening of _Arms and the Man_