when: "'dev' in tags" not working anymore - changed behavior between 1.7.2 and 1.8 for tags?

Hello,

I have ported a bunch of puppet scripts to Ansible and we had a lot of
puppet inner or extended classes.

So basically I decided to switch on tags while including. In
role/basepkg/tasks/main.yml I have
- include dev.yml
  when: "'dev' in tags"
and invoke this via
{ role: basepkg, tags: ['dev'] }
Worked flawlessly with 1.7.2 but now in 1.8 it chokes with:

error while evaluating conditional: 'dev' in tags

Is this deprecated?

Regards Mirko

To answer myself (maybe as documentation):
- I just renamed tags to includes and have an empty includes variable
in the role defaults now.
Regards Mirko