Description

This removeUndefinedValues utility function was added by #2281. However, there's a bug in the implementation: It performs an in loop over the array returned by Object.keys, which means that it iterates over the array indices 1, 2, 3... instead of the actual object keys. That makes it effectively a no-op.

Since no one has noticed this in 3 years, simply removing the function would be one option. It's not clear to me why the TypeError described in #2153 occurred. However, this PR goes with the other option: Implementing the intended behavior by removing the Object.keys so that in iterates over the object's keys.

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