Use exact comparison for bool in approx()

[jvansanten]

Fixes #9353.

[nicoddemus]

Hi @jvansanten,

Was taking a look at the list of PRs and this one seems to have gone unnoticed, sorry about that.

Overall all changes look good to me, I left a comment about the changelog only. Would you like to finish it up? If you don't have the time please let us know so we can do it. Thanks, and sorry for the delay again!