BlobStrings and likely other "only in blob storage" data is invalid.

[Soaryn]

Notably, blob assets are a wild beast; however, I noticed that when trying to make a Polymorphic struct with a BlobString field, the [MayOnlyLiveInBlobStorage] attribute tripped up on it which makes sense, but I was curious if there were any recommended solutions to this.

To be more clear, I'd like to be able to use BlobStrings in a polymorphic struct.