Enum MetadataPolicy

Enum to define the policy for handling behavior of MetadataDictionary::set

Values:

enumerator kReject

Reject the new value if the key already exists.

enumerator kInplaceUpdate

Replace the std:::any value within the existing std::shared_ptr<MetadataObject> if the key already exists

enumerator kUpdate

Replace the std::shared_ptr<MetadataObject> with a newly constructed one if the key already exists

enumerator kRaise

Raise an exception if the key already exists.