Rate limit namespace_id clarification

The docs say both:

An identifier you define, that is unique to your Cloudflare account.

as well as

a positive integer that uniquely defines this rate limiting configuration

That makes it unclear in which they should be unique (between accounts?, environments?, rate limit configs?)

E.g – I have 2 wrangler environments (production, staging) in the same account, each with their own worker deployment.
Should the namespace_id be unique for each environment, even if they share the same name/config?
Cloudflare Docs
Define rate limits and interact with them directly from your Cloudflare Worker
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