learning perl 3rd vs 4th

[Richard Lee]

Currently I own a 'learning perl' 3rd edition and I noticed that 5th 
version is coming out in june.
What I didn't realize was that learning perl 4th edition's been out 
since 2005.

I was going to order 5th version in june but does anyone in here know 
the different between 3rd and 4th version?
Is there a big difference?
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