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We have an internal application that uses s2n from different tasks (one for transmitting, one for receiving), and before this CR, this caused s2n to always clone the wakers and suffer from bad performance.
This change notices that the transmitted context can always be passed down the stack, and improves performance in our case by about ~5%.
If this is too ugly, maybe it is better to do it purely on our end by implementing a replacement to tokio-s2n-tls, but I'll rather use the common implementation and share the goodness.
This is unfortunately a breaking change to anyone that uses the previous waker API.
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.