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### Motivation: As outlined in this [issue](https://github.com/apple/swift-nio/issues/2930) by @weissi, the current performance of calling `description` on `HTTPHeaders` is undermined by the dynamism of Array. ### Modifications: The proposed solution replaces the implementation of `description` to iterate over the items and print them out manually. This provides a faster solution since we bypass the cost of calling into `description` of an Array. ### Result: A more performant implementation of `HTTPHeaders` description. --------- Co-authored-by: Johannes Weiss <johannesweiss@apple.com> Co-authored-by: Cory Benfield <lukasa@apple.com>