Unwanted unicode escapes in custom fields for files/images

[rash]

Hi guys,

I was working with the Images Extra module for quite a while, and now I’m trying to migrate a bunch of those fields to the new core solution that came with PW 3.0.142. So far, anything is great except one thing I neither like nor understand. All custom fields corresponding with an image are stored in the filedata column like so:

{"_field_1_id":"value_1", "_field_2_id":"value_2", etc.}

Now some of the values store unicode escapes for diacritical characters like ü, ö, ä, ß (eg. 'K\u00fcche' instead of 'Küche') while other values of the same type are stored unescaped. Unfortunately I cannot detect any system, values from the same fields store identical values sometimes escaped, sometimes unescaped.

Although the output works fine in any case, looking at things like 'K\u00fcche' slightly depresses me, so I would prefer to store all values in proper, readable characters. How could I do that?