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720db28741
As the same instance of a map is used in context and mutated directly, this leads to a situation where: - Calling WithMediaTypeKeyPrefix from parallel goroutines where the context was based on the same base context can trigger a panic. - A subcontext calling WithMediaTypeKeyPrefix changes the value for another context when they both originate from the same base context. Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>