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Changes between Version 4 and Version 5 of Ticket #70420, comment 9

v4	v5
120	120	1. There is no facility to manage which version of lua is used as the system default.
121	121	1. Uninstalling the `lua` port will break `luarocks` and potentially other lua ports, even though they could use a different version of lua.
122		1. `neovim` depends on `lua51-lpeg`, which depends on `lua-luarocks`, which depends on `lua` and `lua53-luarocks`, guaranteeing that ~~lua 5.3 will be installed when trying to install neovim~~.
	122	1. `neovim` depends on `lua51-lpeg`, which depends on `lua-luarocks`, which depends on `lua` and `lua53-luarocks`, guaranteeing that `lua53` will be installed when trying to install neovim, even though neither `lua51-lpeg` nor `neovim` wants anything to do with lua 5.3.
123	123	1. Building `neovim` is breaking because it links against the `lua.h` provided by the `lua` port (currently 5.3), which is incompatible with neovim and luajit (not for any reasons having to do with `luarocks`).
124	124	1. `luarocks` always runs against the version of lua installed by the `lua` port, because its shebang is `/opt/local/bin/lua`, which is (currently) lua 5.3 by design of the `lua` port.