Perl should have an otherwise for use as a modifier:
That's an immensely huge syntax change, making expressions span statements.
Many people find if ! $o at least as readable as unless $o...
I can believe they think they find it as unreadable, but I think they're wrong. How can it be as readable as unless? It's two distinct units instead of one, and one of the units is symbolic. It's worse when you nestle the bang against another symbolic unit, such as an opening parenthesis.
I hate to sound like a self-proclaimed usability expert, but I do not see how this could be.
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