Describe the bug
With this option, the completion highlights for cmdline and popupmenu will not work.

Which version of Neovim are you using?
NVIM v0.8.1
Build type: Release
LuaJIT 2.1.0-beta3
Compilado por builduser

To Reproduce
Steps to reproduce the behavior:

1. edit minimal.lua provided by this repo adding cursorlineopt = 'number' as an option
2. type : to show cmdline
3. type something and hit tab to show the completion options

Expected Behavior
When choosing the completion options the selected option should be highlighted