Hiding numbers is broken when absolute number+relative number (hybrid)

[ilan-schemoul]

In minimalist and ataraxis mode numbers are supposed to be hidden. But it's buggy. Instead of hiding numbers it only disables absolute number but keep the relativenumber.
Before minimalist (absolute + relative)

after minimalist

Only absolute numbers are removed. Not the relative ones.

The obvious workaround is callbacks

          open_pos = function()
            vim.cmd("ScrollbarHide")
            vim.cmd("setl nonumber")
            vim.cmd("setl norelativenumber")
          end,
          close_pos = function()
            vim.cmd("ScrollbarShow")
            vim.cmd("setl number")
            vim.cmd("setl relativenumber")
          end,

I think the code to disable numbers is complex (especially alldo()). One can just use local settings with setl.
@pocco81 can you care to explain the original design ?