GH-143732: SEND specialization #3043

Job	Run time
x86_64-unknown-linux-gnu/gcc	9m 5s
x86_64-apple-darwin/clang	20m 24s
aarch64-unknown-linux-gnu/gcc	7m 46s
aarch64-apple-darwin/clang	9m 33s
x86_64-unknown-linux-gnu/gcc-free-threading	6m 58s
	53m 46s

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