Closed issue 11381 still not fixed:
https://github.com/ansible/ansible/issues/11381
The test done by jimi-c is not related (he was setting ‘become_user’, not ‘become’).
Here is my test, which shows the problem (using latest devel):
$ cat 11381.yml
`
Hi Albert, the original issue was about an error regarding that value being set to yes and it failing to work. I did a follow-up test with that and it worked, however there was no mention of the above in the issue, so I’ll re-open the issue.
You are right, 1.9.1 was throwing an error, but devel was showing the behaviour of always setting it to ‘true’, as I mentioned on my comment to Brian Coca (and showed here as well)