Enable mapping to nil in enums
Enum in Rails 5 does not map nil values - IOW nil value remains nil, even if there is a key with nil value in the enum definition. This commit overrides the underlying Enum methods so nil value is still mapped. This solution is far from being ideal: it uses dynamic definition of methods which introduces more magic/confusion into the codebase. It would be better to get rid of the nil value in enums.
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