In Issue 1056 the recommended solution was to revert to using PHP 7.2.
Is there a straightforward way of doing this, apart from undoing the PR that made 7.3 the default version?
In the first case I just fixed the error in WP that was causing the problem, but this is not a great solution, is it.
(I have put a restriction into
"php": ">=7.1, <7.3", but will that be enough?)