[KV Feedback]: Entry value doesn't seem to be able contain Response object

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### Type of feedback

General feedback

### Description

Since Web Cache API isn't available on Deno Deploy, I used DenoKV to mimic the cache system. In cache, it is encourage to pass the whole response to cache value. However, it is not the case in DenoKV. When I attempted to pass a Response object to KV like this `kv.put([keys], res.clone())`, it will convert Response to an empty plain object `{}`.

I wonder if it is the design. If so, I think we should be clear in the document rather than left generic `` type.

### Steps to reproduce (if applicable)

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### Expected behavior (if applicable)

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### Possible solution (if applicable)

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### Additional context

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Start by reviewing the DenoKV value-serialization documentation and the behavior of kv.put([keys], res.clone()) described in the report. Confirm how Response values are handled, then document the supported value expectations and whether the generic wording is misleading; done when the limitation and usage guidance are clear.

Written by the indexing model from the issue text.