OpenApi.fromApi corrupts JSON.rawJSON on cache hits #7239

What version of Effect is running?

4.0.0-rc.108

What steps can reproduce the bug?

Run the same Effect Play example with these versions:

• 4.0.0-beta.107: https://www.effect.website/play#9cf62c4c6bea
• 4.0.0-rc.108: https://www.effect.website/play#557f76a45080

The example calls OpenApi.fromApi twice for an API whose OpenAPI transform adds a
JSON.rawJSON("9223372036854775807") value.

What is the expected behavior?

Both calls should serialize the value as the exact JSON number:

{"value":9223372036854775807}

What do you see instead?

In 4.0.0-rc.108, the first call is correct, but the cached second call serializes:

{"value":{"rawJSON":"9223372036854775807"}}

4.0.0-beta.107 serializes the exact JSON number on both calls.

Additional information

This appears to be caused by cloneOpenAPISpec, added in #6550. The clone copies the enumerable rawJSON property into a plain object and loses the special JSON.rawJSON behavior.