[DBTypeMemo] [DBTypeWideMemo] when/how to use it?

I found by Datamodeler the [DBTypeMemo] attribute
In the documentation there is only a reference in the Changes list and it exists also [DBTypeWideMemo]
How and when can we use it?
Is it used only in Tblob or can be used in Tarray,string to create a memo?
Can this attribute be used when creating a db memo from a string in a class instead of using a size of 65536 characters?
please include it in Mapping/attributes in documentation. Thanks

It only makes sense in TBlob, to indicate Aurelius that the blob is actually a text/memo field. When the property is a string, it's not needed as it's already indicated as text/memo.