Status of thread safety in PHP 7.0 & 7.1 ZTS?

Quoting https://twitter.com/krakjoe/status/887743571515912196

Just FYI ... Thread safety in PHP 7.0 and 7.1 is broken: If you are
using ZTS upgrade to 7.2 ... peril awaits those who ignore this warning

Should we ditch PHP 7.0 ZTS and PHP 7.1 ZTS?

I ran into this while discussing the pthreads extension:
https://github.com/krakjoe/pthreads/pull/720#issuecomment-317177130

Jan