THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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- This will result in a record with key=null, value="myvalue" and headers={"h0": "v0", "h1": "v1"}
- This will result in a record with key="mykey", value=null and headers=null
- This will result in a record with key=null, value=null and headers={"h0": "", "h1": "v1"}
- This will result in a record with key="mykey", value=null and headers={"h0": null, "h1": "v1"}
- This will result in a record with key="mykey", value="myvalue" and headers={"NULL": "v0"} This is return an error because headers cannot have a null key.
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