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Answers and rating deltas for

Is this php behaviour explained somewhere in manual? (strings with zeroes comparison)

Author Votes Δ
Kai Chan 4 +4.14
Shehabix 3 +2.61
kirugan 2 +0.50
hakre 1 -0.32
djthoms 0 -3.85
Last visited: Sep 14, 2014, 5:07:29 AM