Creating table from a Pydantic `BaseModel` class breaks that class

Using fastlite to create a table from a Pydantic BaseModel class causes instantiating that class to raise an exception. https://colab.research.google.com/drive/1y0KJlvwt9BHaMAeSJdGsIBCjQpuTQ3iG#scrollTo=MvtufG6J_BBa illustrates this problem, identifies its cause, and provides a potential solution. Let me know what you think. I'd be happy to make a PR if desired!