Add instructions on date serialization at astro-actions.mdx

[kaylaa0]

Description

This PR adds documentation regarding date serialization in Astro actions, including an example for the following description:

Actions use JSON.stringify() under the hood, which turns dates into their string representation. You can use z.coerce.date() instead.

Including this new example will help guide developers when they encounter issues with date interpolation.

Related issues & labels (optional)

• Closes Document Actions input serialization #11644
• Suggested label: improve or update documentation

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[sarah11918]

Thank you for this helpful addition, @kaylaa0 ! It led to a discussion with our team because we realized that we hadn't made it very clear that this list is not really about what is supported, but what we've added special handling for. So in fact, our introduction of this list wasn't technically correct, and that's why something like z.coerce.date() wasn't included in the first place!

I've update the wording (sorry, there's no good way on GitHub for me to just make a suggestion to parts of the document that you didn't change, so I had to edit/update the file directly) to both use your example so people will get the idea, but also clarify what the list is.

What do you think about this?

[kaylaa0]

Thank you for your in-depth explanation. I now have a better understanding of the issue. Your updates to the file are well worded and provide clear guidance for other developers as well.

I think it looks great!

[sarah11918]

Great! I'm glad this works for you and addresses your initial intention @kaylaa0 !

Thank you again for taking the time to contribute, leading to this helpful docs improvement, and welcome to Team Docs! 🥳

[yanthomasdev]

LGTM! Good job @kaylaa0, welcome to Team Docs!