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Please note that these changes do *not* affect the *public* interface of the `Metadata` class, but only touches internal structures.[1] These changes were prompted by looking at the `getAll` method, which simply returns the "private" metadata object to the consumer. This seems wrong conceptually, since it allows way too easy/accidental changes to the internal parsed metadata. As part of fixing this, the internal metadata was changed to use a `Map` rather than a plain Object. --- [1] Basically, we shouldn't need to worry about someone depending on internal implementation details.