v0.16.9

• Support F expression in .save() now
• IntEnumField accept valid int value and CharEnumField accept valid str value
• Pydantic models get created with globally unique identifier
• Leaf-detection to minimize duplicate Pydantic model creation
• Pydantic models with a Primary Key that is also a raw field of a relation is now not hidden when exclude_raw_fields=True as it is a critically important field
• Raise an informative error when a field is set as nullable and primary key at the same time
• Foreign key id's are now described to have the positive-integer range of the field it is related to
• Fixed prefetching over OneToOne relations
• Fixed __contains for non-text fields (e.g. JSONB)