When I try to save custom data in admin edit (album or image) I get an empty field, unless filter-custom_data is enabled.. Then the field is called Special data and it works. I didn't find the documentation for this filter plugin, that is a new one afaik.
Are you planning to disable the custom data option without the pulgin enabled?
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Can I have some info on the usage of this filter plugin?
With such a plugin you could, for instance, recast the custom data field as multiple fields or do special verification of the data input.