ffi protocol improvements #626

Job	Run time
Build (x86_64-pc-windows-msvc)	11m 43s
Build (aarch64-pc-windows-msvc)	9m 42s
Build (x86_64-apple-darwin)	8m 51s
Build (aarch64-apple-darwin)	9m 10s
Build (aarch64-apple-ios)	8m 21s
Build (aarch64-apple-ios-sim)	8m 57s
Build (x86_64-unknown-linux-gnu)	7m 0s
Build (aarch64-unknown-linux-gnu)	5m 3s
Build (aarch64-linux-android)	6m 41s
Build (armv7-linux-androideabi)	6m 45s
Build (x86_64-linux-android)	6m 26s
	1h 28m 39s

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