prints both == and eq

Yes - though making assumptions about equivalence based on the output of perl's print() function is not a good practice.
For example:

C:\>perl -le "print sqrt(2);"
1.4142135623731

C:\>perl -le "print 'WTF' unless sqrt(2) == 1.4142135623731;"
WTF
[download]

Cheers,
Rob