I think this is a leftover from the mmap()-like code that used to be
in the engine, but now it's a lot of complexity to basically test this:
- Was this a memory access violation?
- If no, crash.
- If yes:
- Was it part of a CTStream?
- If no, crash.
- If yes, crash.
Instead, let's just crash. :)
(If I'm misunderstanding this, just roll back from revision control.)