bug#81560: 31.0.91; dframe-update-speed specifies :type integer

> Date: Wed, 05 Aug 2026 17:42:10 +0200
> From: Daniel Mendler via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <[email protected]>
> 
> The speedbar uses the customizable variable `dframe-update-speed' to
> check for updates. This variable has variable :type `integer' but
> shorter delays are supported, e.g., 0.5. I suggest to change the
> variable :type to `number'.

Actually, 'number' is also inaccurate: the value can be in the format
of the value returned by current-idle-time, because the value is
passed to run-with-idle-timer.