Allow nullable with default null option

[Thijmen]

Fixes #1409

[changeset-bot]

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[Thijmen]

I'll leave the changeset up to you.

[stijnvanhulle]

@all-contributors please add @Thijmen for code

[allcontributors]

@stijnvanhulle

I've put up a pull request to add @Thijmen! 🎉