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LIMITS_OF_ETP

The emacs implementation of "text-properties"
*requires* text to attach them to.
                                                  Emacs::Rep
   In my application, I need a way to
   represent deletions: changes with no
   characters left to attach to.

   I tried some hacks, like attaching deletion
   information to the following character.
   This gets ugly, e.g in the multiple-adjacent-deletions case.

   Emacs has an alternate system called "overlays" that
   are better for this: you can attach them to
   zero-length regions, i.e. the positions between
   strings.

   Consider the multiple-adjacent-deletions case
   again though:  these end up *unordered*.
   From emacs point of view, they're all on top of each
   other.
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