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Feature #11527
openIPAddr#mask_addr isn't a method
    Feature #11527:
    IPAddr#mask_addr isn't a method
  
[ruby-core:<unknown>] 
Description
Right now there's no way to get the current value of an IP address's mask from an IPAddr instance. While there's an instance variable (@mask_addr), there's no attribute reader to get it's value, and relying on reading the instance variable isn't pretty nice for a stdlib (stable as it might be).
Is there any particular reason why this is not public, or would a patch/pull request adding the corresponding attr_reader be accepted?
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