[FLOW3-general] package:freeze - what does this do?

[Jacob Floyd]

Hello Everybody,

I'm guessing that package:freeze is part of the new speed feature. I'd like 
to understand it a bit better.

What does package:freeze do?

If I update a frozen package (eg using `git pull` on the base 
distribution), will it continue to use the reflected classes of the old 
version?

Or will FLOW3 notice that the packages have been updated and re-compile 
them?

Do I need to unfreeze packages before I update them with `git pull`?

Thanks!
Jacob Floyd