Has something happened?
Nope.
Why is while (<>) not doing what it use to?
It's doing the same thing as it has since at least 1999, when I started using Perl, and probably always has.
How do I get the old behavior
<> reads either from files named as command-line arguments or from STDIN. It does not, and never has, returned the literal command-line arguments themselves.

If you want to access the literal command-line arguments, you can find them in the array @ARGV. e.g.: 

$ perl -E 'for (@ARGV) { say $_ }' foo bar baz
foo
bar
baz

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In reply to Re: while(<>) in perl 5.22 by dsheroh
in thread while(<>) in perl 5.22 by xorl

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