unknow option 'splitkeep' in neovim 0.8.2

[y1rn]

Describe the bug
show unknow option 'splitkeep' error.

System information

• OS: linux
• Neovim version: 0.8.2
• Aerial config:

require("aerial").setup {}

To Reproduce
while jumping to declaration.

Screenshots

Additional context

need to change splitkeep option checking from:

if vim.o.splitkeep and vim.o.splitkeep ~= "cursor" then

to

 if vim.fn.exists('&splitkeep') == 1 and vim.o.splitkeep ~= "cursor"

[prgres]

Same happens to me and above solution works

[stevearc]

Thanks for the report! Fixed and regression tests added.