Don't use the & form unless you require it's special effects. If you don't
know what those are, you don't need them. I'm not trying to be snarky or a
I normally use parentheses around the arguments, in part just to make it
clear what is being passed to the subroutine. At times, I omit them, but
I can't really articulate the conditions that apply. I suppose aesthetics
bear on the decision, but I tend to "err" on the side of ().
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| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||