I've used vi and nvi and (now) vim, and tried neovim, but :! is broken and “Conform to POSIX vi” is one of their “Non-goals”.
Nvim's `:!` behaviour was a deliberate design decision, which is one of the reasons I just stick with Vim9.
Nvim's `:!` behaviour was a deliberate design decision, which is one of the reasons I just stick with Vim9.