Handle Collection Type fields

Feature description: Correctly handle fields such as List[str]

Curently when a field is of a collection type such as dict, list, Mapping, Sequence etc. the behaviour is broken. For the model

class ExampleModel(BaseModel):
        text: str
        many_texts: Sequence[str]

the output is broken and pressing the submit button results in the following error Whoops! There were some problems with your input: many_texts: field required

Problem and motivation:

I have forms where some of the inputs are an arbitrary number of strings. Up until now I have solved this with a text_area widget, and prompt the user to separate their inputs with commas. Then with a custom validator the strings can be put back into a list. While this kinda works, it is a very hacky solution, it prevents me from using this package without breaking up my model

Is this something you’re interested in working on?

Currently I don’t have the capacity but it is something that am willing to look into in the near future (in a couple of months)

[disbr007]

@LukasMasuch Just wanted to bump this as I am running into the issue as well. Any thoughts on a solution or workaround? I’d be happy to try to help contribute if you have ideas.

Great package btw!

[github-actions[bot]]

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