In the Field system I built with Python (covered in the Field Encapsulation Pattern series of posts, found here), I ended up coming across an interesting problem. I thought I’d post my thoughts on this issue and how I ended up solving it.

As a quick recap, the system defines classes which are definitions of fields on a data model, representing the rules on how to store, represent, and validate, say, a date, a url, etc. Each of these fields will have a list of validation rules that it has to meet. An example of this is an IntegerField...
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