Handle "type" being an array of strings in JSON schema converter

[adrianisk]

Summary

Fixes https://github.com/recap-build/recap/issues/412

Updates to handle the case where a type in JSON schema is an array of strings, like {"type": ["null", "string", "boolean", "number"]}. From the JSON schema docs

The type keyword may either be a string or an array:

If it's a string, it is the name of one of the basic types above. If it is an array, it must be an array of strings, where each string is the name of one of the basic types, and each element is unique.

Details

I added tests to make sure nullable/optional types are converted correctly, and that properties of an object that are both not required & a union with null ({"type": ["null", "string"]}) are not made "double nullable".

[criccomini]

@adrianisk checking in here

[adrianisk]

Heyo, wrapping up a project that needs to get done today, then I'll take a look at this!

Edit: or first thing tomorrow 😪

[criccomini]

@adrianisk I've merged your PR and made the remaining tweaks here:

https://github.com/recap-build/recap/pull/426

Note that my PR results in a subtle change to the way null JSON schema types are handled. See the PR for details.

[criccomini]

Released in 0.12.0:

https://pypi.org/project/recap-core/0.12.0/