don't attempt to save AF::WithMetadata::MetadataNode#file_hash #5320
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ActiveFedora::WithMetadata::MetadataNode
provides a#file_hash
attribute,but writing to it, even with the existing data, prevents all saves.
Wings needs to map data in and out of this class freely, and this attribute
functions as a honeypot. it baits Wings to preserve the data, and then fails
save when the converters try to do keep the existing data. since any attempt to
write this data will break save, ActiveFedora should treat it as read only.
never include
MetadataNode#file_hash
in changed attributes lists when Wings isloaded.
i think this is the issue presently blocking #5278.