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It might not be obvious but by rendering a Generator you're asking React to perform a mutation during the render phase. This already doesn't work in development because we do key validation, thus consuming the generator. It led to some confusion: #11864, #12995, #11502, #7536.
Let's warn about this pattern right as we encounter it. The new warning shouldn't be noisy because the pattern is already broken in development (and as you can see in #12995 (comment), it's fragile in production).
I'm not sure how to detect generators in browsers that don't support toStringTag but I figured warning in modern browsers is sufficient.
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