'svn diff' and binary files

Hey all,

I've just noticed some 'interesting' behaviour w.r.t. the way that 'svn
diff' works for binary files.

If I try and get a patch for a binary file for a specific revision:

svn diff -c X svn://....../binaryfile.dll
>

I correctly get the following output:

Index: moitaka.dll
> ===================================================================
> Cannot display: file marked as a binary type.
> svn:mime-type = application/octet-stream
>

However, I've noticed that (using ProcessMonitor from sysinternals.com),
even though it couldn't display a valid patch, both copies of the file seem
to be downloaded into %TEMP%.

Is this valid behaviour? Does 'svn diff' require both copies of the file
*before* it can determine that a diff is not possible?

Cheers,

---
Daniel Becroft
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