[Metadata] Fix modifying metadata by serializing it early #4670
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Metadata cannot be stored as
object
ORM type, because objects arecompared (===) by reference, not by value, what means that changes
would not be persisted.
The only working way I have found is to store metadata as
text
type and serialize it on MetadataContainer::setMetadata() method
call. However, after every metadata modification we have to use that
method once again, if not - changes won't be persisted.