How to prevent ‘changed’ flag when ‘register’-ing a variable?

Question:

I have a register task to test for the installation of a package:

Every run it gets reported as a “change”:

I don’t regard this as a change… it was installed last run and is still installed this run. Yeah, not a biggy, just one of those untidy OCD type issues.

So am I doing it wrong? Is there some way to use register without it always being regarded as a change?

The [verbose] output is untidy, but the only way I’ve found to get the correct return code.

TASK: [test for nginx] ********************************************************
changed: [vm1] => {"changed": true, "cmd": ["dpkg", "-s", "nginx-common"], "delta": "0:00:00.010231", "end": "2014-05-30 12:16:40.604405", "rc": 0, "start": "2014-05-30 12:16:40.594174", "stderr": "", "stdout": "Package: nginx-common\nStatus: install ok
...
\nHomepage: http://nginx.net"}

Answer:

It’s described in official documentation here.

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