Hello all,

in my application we use and love marshmallow. We have a lot of dynamic coding, therefore we access fields e.g. over the declared_fields attribute. Also we need most of the time the Field.data_key attribute which is defined as str | None.

I would like to suggest an option, which always sets the data_key so that it will never be None. If the user provides it, fine. Else, just set it to the field name. I guess this could also simplify some coding, since you can expect that this attribute is always set.

What do you think?