TODO: Unfortunately, cannot (yet) use vim.version for tmux version comparison, because `vim.version.parse(…,{strict=false})` does not coerce tmux's funny "tmux 3.3a" version string. 6969d3d749/runtime/autoload/provider/clipboard.vim (L148)
6969d3d749/runtime/autoload/provider/clipboard.vim (L148)
g:terminal_color_{0-15}