Update map iterator to be index based (#1061) #3231

Job	Run time
docs	5m 2s
cargo-deny (advisories)	3m 22s
cargo-deny (bans licenses sources)	3m 16s
build-and-test (ubuntu-latest, x86_64-unknown-linux-gnu)	16m 11s
build-and-test (macos-latest, x86_64-apple-darwin)	24m 3s
build-and-test (macos-latest, aarch64-apple-darwin)	16m 26s
build-and-test (windows-latest, x86_64-pc-windows-msvc)	25m 16s
build-fuzz	2m 23s
fmt	15s
rust-analyzer-compat	10m 33s
publish-dry-run (ubuntu-latest, wasm32-unknown-unknown) / publish-dry-run	41s
publish-dry-run (ubuntu-latest, x86_64-unknown-linux-gnu, --feature-powerset --exclude-features d... / publish-dry-run	47s
complete	1s
	1h 48m 16s

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