> One approach is to expose the `prefer` option of `openp` to
> `locate-file` so we can use it in `require-with-check`, as in the
> patch below.

Another is to replace the `assoc` check with one that is more lenient,
ignoring difference in file extensions.  E.g. the patch below.
This makes the change more localized, at the cost of making
`require-with-check` slower and less strict.

WDYT?


        Stefan