pointing at the second byte of a character
        vim.str_utf_start('æ', 2)
<

    Parameters: ~
      • {str}    (`string`)
      • {index}  (`integer`)

    Return: ~
        (`integer`)

vim.stricmp({a}, {b})                                          *vim.stricmp()*
    Compares strings case-insensitively.

    Parameters: ~
      • {a}  (`string`)
      • {b}  (`string`)

    Return: ~
        (`0|1|-1`) if strings are equal, {a} is greater than {b} or {a} is
        lesser than {b}, respectively.

vim.ui_attach({ns}, {opts}, {callback})                      *vim.ui_attach()*
    WARNING: This feature is experimental/unstable.

    Subscribe to |ui-events|, similar to |nvim_ui_attach()| but receive events
    in a Lua callback. Used to implement screen elements like popupmenu or
    message handling in Lua.

    {callback} receives event name plus additional parameters. See
    |ui-popupmenu| and the sections below for event format for respective
    events.

    Callbacks for `msg_show` events are executed in |api-fast| context;
    showing the message should be scheduled.

    Excessive errors inside the callback will result in forced detachment.

    WARNING: This api is considered experimental. Usability will vary for
    different screen elements. In particular `ext_messages` behavior is
    subject to further changes and usability improvements. This is expected to
    be used to handle messages when setting 'cmdheight' to zero (which is
    likewise experimental).

    Example (stub for a |ui-popupmenu| implementation): >lua
        ns = vim.api.nvim_create_namespace('my_fancy_pum')

        vim.ui_attach(ns, {ext_popupmenu=true}, function(event, ...)
          if event == 'popupmenu_show' then
            local items, selected, row, col, grid = ...
            print('display pum ', #items)
          elseif event == 'popupmenu_select' then
            local selected = ...
            print('selected', selected)
          elseif event == 'popupmenu_hide' then
            print('FIN')
          end
        end)
<

    Parameters: ~
      • {ns}        (`integer`) Namespace ID
      • {opts}      (`table<string, any>`) Optional parameters.
                    • {ext_…}? (`boolean`) Any of |ui-ext-options|, if true
                      enable events for the respective UI element.
                    • {set_cmdheight}? (`boolean`) If false, avoid setting
                      'cmdheight' to 0 when `ext_messages` is enabled.
      • {callback}  (`fun(event: string, ...)`) Function called for each UI
                    event

vim.ui_detach({ns})                                          *vim.ui_detach()*
    Detach a callback previously attached with |vim.ui_attach()| for the given
    namespace {ns}.

    Parameters: ~
      • {ns}  (`integer`) Namespace ID

vim.wait({time}, {callback}, {interval}, {fast_only})             *vim.wait()*
    Wait for {time} in milliseconds until {callback} returns `true`.

    Executes {callback} immediately and at approximately {interval}
    milliseconds (default 200). Nvim still processes other events during this
    time.

    Cannot be called while in an |api-fast| event.

    Examples: >lua
        ---
        -- Wait for 100 ms, allowing other events to process
        vim.wait(100, function() end)

        ---
        -- Wait for 100 ms or until global variable set.
        vim.wait(100, function() return vim.g.waiting_for_var end)

        ---
        -- Wait for 1 second or until global variable set, checking every ~500 ms
        vim.wait(1000, function() return vim.g.waiting_for_var end, 500)

        ---
        -- Schedule a function to set a value in 100ms
        vim.defer_fn(function() vim.g.timer_result = true end, 100)

        -- Would wait ten seconds if results blocked. Actually only waits  100 ms
        if vim.wait(10000, function() return vim.g.timer_result end) then
          print('Only waiting a little bit of time!')
        end
<

    Parameters: ~
      • {time}