Including Pydantic

[yellowbean]

Most of input to model a deal is just a Python list or map

that would pose certain chanllenage if user has a slight typo.

Using Pydantic will supply a good type hints and documentation support

[yellowbean]

Tried with : https://koxudaxi.github.io/datamodel-code-generator/openapi/ But tagging requires further fine-tuning

The trouble is how to present ADT in Python in a niceway