If you look at the commit 55df9bb you'll see it was an edit, not the introduction of a message. I don't always remember my style rules when I'm just editing something.

Text editors will display string literals in a different color, but they won't display `targetUser.name` in a different color depending on whether or not it's a string.

`"" + a + " blah " + b` is recognizably an expression that is intended to be a string, while `a + " blah " + b` you would need to read to the `"` before that was clear.

In addition, not starting a string construct with `"" +` can lead to bugs, for example in `a + b + " blah"`, if `a` and `b` are integers, they will be added rather than concatenated. In `"" + a + b + " blah"`, they would be concatenated as intended.