On Tue, Jun 4, 2019 at 9:55 PM Chris Muller <ma.chris.m at gmail.com> wrote:
>
> Hi Nicolas,
>
>>
>>
>> I did mean that the test omitted to check joined length, so an implementation returning 'a|b|c|' would pass...
>
>
> The original test didn't test that either, but I went ahead and added it into CollectionsTests-cmm.315.

Err, I guess it did, implicitly, as does the new one.