postinstall.sh copies 82GB?

A couple of general newbie questions...

When postinstall.sh had run it displayed: 82309042176 bytes (82 GB) copied, 1826.08 s, 45.1 MB/s

I thought the script was installing Ruby and various things -82Gb copied?

Also, what are the Python development headers and why do we need them?

Thanks for any answers

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Answers

postinstall.sh installs Ruby, Git, and several other packages (it's just a text file, so feel free to read it).

We need the Python development headers to be able to compile and install libraries.