One thing that bit me a few months ago: sort in scalar context is undefined.
That isn't a big deal until you do this in a sub:
return( sort @some_array );
that is supposed to return a sorted list. And then you wonder how many elements the list contains:
my $count = get_the_sorted_list(); #Scalar context propagates to sort
That's pretty annoying when you happen to do it, and pretty important to know about so you don't. I sure was surprised the first time I encountered it.
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