Make mapv_into_any() work for ArcArray, resolves #1280 #352

Job	Run time
clippy/stable	16s
blas-msrv	58s
cross_test/s390x-unknown-linux-gnu/stable	6m 46s
cargo-careful	2m 14s
cross_test/i686-unknown-linux-gnu/stable	1m 34s
docs/stable	19s
format/nightly	10s
miri	7m 52s
nostd/thumbv6m-none-eabi/stable	17s
tests/stable	37s
tests/beta	39s
tests/nightly	33s
tests/1.64.0	36s
conclusion	1s
	22m 52s

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