Possible not expected behaviour with "delete" option

[lugarci1]

Hi, I was trying to make a mirror backup of a folder in my machine with the
following command:
rsync -avh --delete /source/ /destination

But the extra files that where on "destination" didn't got deleted. Where
as doing:
rsync -avh --delete /source/ /destination/
worked as expected.

I wonder if this is correct, or it shouldn't be like that.
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