Re: string-delete consing

[Kevin Ryde]

I wrote:
>
> I made changes to string-filter and string-delete.  At the same time I
> made them use substring/shared

I changed my mind about this and made them plain copy-on-write
substrings.  The srfi introduction talks about them being "sharing
allowed" but the individual descriptions only say it might be the
input string returned when there's nothing deleted.