I want to understand how the alt key behaves on terminals.
From some reading it appears that the "meta key" has been replaced on modern systems with sending Esc+ instead, why is that? What is the difference between meta and Esc+?
Is there a difference between what mac does vs what linux does when you hit the alt key?
Here is some discussion related to being unable to map the meta-modifier in vim because of what I'm pointing out here:
https://github.com/neovim/neovim/issues/3412#issuecomment-174333178