Drew Adams <drew.adams@oracle.com> writes:

> Suggestion:
>
>   Don't use this argument to insert a default value --
>   use DEF for that.  You can use INITIAL-INPUT, for
>   example, to insert a prefix common to all completion
>   candidates.

Ok, thanks - I went with your version.

> 5. The doc already says that users can yank DEF with `M-n'.
>    (Or if it doesn't then that should be said where DEF
>    is described, not where INIT is described.

It didn't, so I added that, along with a hint mentioning
`minibuffer-with-setup-hook'.

Updated patch: