Don't create a new object every time IPv6::include? is called
#127
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…ely increasing performance
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Was writing code that relied heavily on
include?for both IPv4 and IPv6 addresses and noticed a x30-40 slowdown comparing IPv6 addresses versus IPv4 addresses. Looking at the library it's clear that this slowdown is because eachinclude?creates a new IPAddress::IPv6 object which is not the case for IPv4 addresses. Ran the test pack and came back clean.