For those that do not grok this delightful Perl obfuscation, I unveil the secret of <<=>>:

print <<=>> 1;
text

print "done\n";

# is actually

print << "BLANK_LINE" => > 1;
text
BLANK_LINE
print "done\n";

# is actually

print << "BLANK_LINE", > 1;
text
BLANK_LINE
print "done\n";
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And the comma is superfluous.

japhy -- Perl and Regex Hacker