Motivation:
The new Headers interface contains methods to getTimeMillis but no add/set/contains variants. These should be added for consistency.
Modifications:
- Add three new methods: addTimeMillis, setTimeMillis, containsTimeMillis to the Headers interface.
- Add a new method to the Headers.ValueConverter interface: T convertTimeMillis(long)
- Bring these new interfaces up the class hierarchy
Result:
All Headers classes have setters/getters for timeMillis.
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