ties/slurs crossing repeats ("open slurs")

[Henning Hraban Ramm]

If a tie or slur is crossing a \repeat volta, is there a better solution 
than using \laissezVibrer?

I found that suggested in this old thread:
https://lilypond-user.gnu.narkive.com/wXFWvV5y/tie-at-end-of-first-repeat
… but it’s semantically wrong.

Hraban