FFI: get scalars from arrays #6607

Job	Run time
Rust publish dry-run	23s
check-java-publish-build (aarch64-unknown-linux-gnu, runs-on=30560289706/runner=arm64-medium/imag...	1m 27s
check-java-publish-build (x86_64-unknown-linux-gnu, runs-on=30560289706/runner=amd64-medium/image...	46s
Compat check / compat-test	54s
Python (wheel build)	6m 29s
	9m 59s

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