Toby Zerner 4792a47265 Define static properties on SerializeAction subclasses
Explained in d1e7453ffd11d8b58672f6771e62c53e7441670b.

If we ever come up with a better way of doing this it should be easy to
change over, since modification of these properties by extensions is
abstracted by an Extend API.
2015-06-18 12:24:18 +09:30
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