>> that's not true.  it's still useful even with the temporary copy.
>> and the temporary copy makes sure things aren't changing
>> out from under acme's feet.
>
> i'm not sure what statement you're refuting.

"you'd have to convince it to not read the entire file preemptively to
make this a useful feature."

>  the reason i think
> making the copy is a problem for a 7 gb file is the excessive time
> it takes for big files.

copying 7gb doesn't take that long.
it certainly takes less time than rewriting
acme to remove a fundamental assumption.
if you're editing a 7gb file i think you're willing
to wait a little while.

> does the acme temp file get entirely rewritten when one file
> changes?  i.e. is this the mbox problem?

no

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