[Docs]: explain exactly why JSON arrays are not supported

[aartoni]

Link to page

https://next-intl.dev/docs/usage/messages#arrays-of-messages

Describe the problem

I know this has been discussed before, but most related issues seem to reference older conversations I can't track down. Could someone summarize the key points or link to the relevant threads? Should we add the produced summary to the documentation itself?

[github-actions]

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