are known diff failures complex?

Hi all,

I'm planning to use the diff framework to determine whether two directories
are identical.

Since I've now seen a case where diff actually fails (and needs to be fixed
if I'm going to use it), I fear that many more will come up and that I
shouldn't endeavour fixing diff to become precise enough to depend on it.

Does anyone reading this know of a diff error that is inherently hard to fix
within a short timespan?

Thanks
~Neels

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