It's been reported that YAML parsing errors
would occur on certain Ansible/Python combinations for some reason.
It appears that a bare `{{ matrix_dimension_admins }}` would sometimes
yield things like `[u'@user:domain.com', ..]` (note the `u` string prefix).
To prevent such problems, we now explicitly serialize with `|to_json`.
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| .. | ||
| defaults | ||
| tasks | ||
| templates/systemd | ||
| vars | ||