I have a WordPress plugin which was originally 26kb zipped (79kb uncompressed).
I installed it, then made some live changes, then downloaded it and found that the plugin folder is showing 4.2MB in Finder!
Expanding all the folders in one Finder window, I can confirm that there is maybe 50KB in there unzipped.
What is going wrong? Even when I zip it it's 3.8MB. Where is this extra data coming from? Right now I'm blaming the Mac, but maybe this is wrong.