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I have a very specific use case for Entity Reference that implies having a reference field for every entity type, and I thought it would be nice if the 'target_type' setting would be available in the field instance settings, thus allowing me to work with only one reference field instead of one field per entity type.
Finally got around to finish up the work on this (first mentioned in
I'm going to wait a few days and ask about this, but I'm pretty sure there's no workaround and I'll probably won't fix it myself. Just wanted to get the patch here so others won't waste their time if they have a similar use case.