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Contains a metaclass and helper functions used to create
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Recall that a metaclass is the "type" of a class.
(A class is to a metaclass what an instance is to a class.)

In this case, we use the GeneratedProtocolMessageType metaclass
to inject all the useful functionality into the classes
output by the protocol compiler at compile-time.

The upshot of all this is that the real implementation
details for ALL pure-Python protocol buffers are *here in
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Generate a new Message instance from this Descriptor and a byte string.

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Construct a class object for a protobuf described by descriptor.

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