Move the isArray logic into the decodable/encodable type helper.#10822

Merged

bzbarsky-apple merged 2 commits intoproject-chip:masterfrom bzbarsky-apple:nicer-decodable-encodable-type

Oct 23, 2021

+165-130

Commits on Oct 22, 2021

Move the isArray logic into the decodable/encodable type helper.
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Move treatment of args as const ref into the helper as well, so we
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