Use last header value for JetStream messages #1239
Merged
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As republish will append new headers, using first value could lead to misleading data when a message is republish from one stream to another.
This commit fixes it by always picking the last header value.
reference ADR issue: nats-io/nats-architecture-and-design#250
Signed-off-by: Tomasz Pietrek <tomasz@nats.io