In the case of 'set_fact' you should not see much difference, but in
most other cases map will always be faster, with_ executes the
task once per item, except when squashing, but that is magic reserved
to only a few plugins.
FYI the 'item's part is equivalent of loop: '{{ [ "four", "five",
"six"]
I would like to understand semantics of `with_items` in ansible and compare
this approach to `map` for example.
For example, let consider:
`{{ ["1","2", "3"] | map('regex_replace', '^(.*)$', \1'some tail') tail
}}`
How to reach the same effect using `with_items` ?
And in general how
