An entity field must be set to null in order to be unset, yet model definitions don't allow it

It looks like the neither setting a field to undefined nor using delete entity.field actually unsets the value in the database.
See: https://github.com/typeorm/typeorm/issues/2934

This conflicts with the TypeScript definitions of models generated by Hydra (warthog?), since they don't allow null as value even for optional fields.

For example:

export declare class MemberMetadata extends BaseModel {
    name?: string;
    avatar?: DataObject;
    about?: string;
}