Commits on May 2, 2011

1. Don't include modules for which the mandatory primitives aren't imple… …

   …mented.
   
   IPAddress::IPv6 doesn't implement the *each* method (required for the *Enumerable* module) nor the *<=>* operator (required for the *Comparable* module), so it doesn't make sense to include these modules.
   
   Including these modules makes the IPv6 instances respond to methods like *to_a* (from the *Enumerable* module) and *between?* (from the *Comparable* module), but these methods result in a NoMethodError exception (for the *each* and *<=>* methods respectively).
   
   Example:
   
   irb > IPAddress('::1').to_a
   NoMethodError: undefined method `each' for #<IPAddress::IPv6:0x1016b3990>
   	from (irb):1:in `to_a'
   	from (irb):1
   
   irb > IPAddress('::1').between? 1, 2
   NoMethodError: undefined method `<=>' for #<IPAddress::IPv6:0x1016c5cd0>
   	from (irb):1:in `between?'
   	from (irb):1
   
   
   From the standard Ruby rdoc:
   
   ri Enumerable
   
   The class must provide a method *each*, which yields successive members of the collection. 
   
   ri Comparable
   
   The class must define the *<=>* operator, which compares the receiver against another object

   

   pvdb committed May 2, 2011
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