Re: [vim/vim] Feature Request: can use setbufvar() to set window options before buffer has a window (Issue #21089)

mao-yining left a comment (vim/vim#21089)

> The documentation states that the "a local to window" option cannot be changed using setbufvar().

The docuement states that window "variable" can't be changed. 'number' is an "option". Scope to document, nothing reject what I am expecting.

> Since there are no window numbers or window IDs, I assume that is simply how it works. What do you think?

Seems when a buffer has no windows can't set that value.

However, how do it remember its previous windows option?

```vim
vim9script

set number
var bufnr = bufadd(null_string)
execute $'new +{bufnr}buffer'
setbufvar(bufnr, "&number", false)
quit
execute $'new +{bufnr}buffer'
echo &g:number bufnr->getbufvar('&number') bufnr
```


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