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Support null in content PATCH to delete a field value #187 #513
referenced this pull request
Mar 12, 2018
Just two minor comments, otherwise looks good to me.
I pretty much had to make my peace with the fact that handling of default values and missing values is somewhat broken in Plone itself, and there's only so much we can do about that in
Resetting the field to
missing_value and documenting it as such feels like the least bad thing to do, and is what would meet people's expectations the most I would think.