Why do we have an overlap in fzf options?

[tapyu]

In cheatsheet_syntax.md, we see that we can pass fzf option via --fzf-overrides <arg>, but navi also accepts (some) fzf options directly. Why do we have an overlap in fzf options?

---  --fzf-overrides '--query="Google Drive repository" --header-lines=5'

and

--- --header-lines 5 --fzf-overrides '--query="Google Drive repository"'

do exactly the same thing. Plus, there is an inconsistent syntax in fzf ('--header-lines=5) and how navi handles fzf options (--header-lines 5).