remove type fields #733

Job	Run time
rustfmt	12s
Test stable ubuntu-latest --no-default-features	1m 31s
Test stable ubuntu-latest	1m 51s
Test stable ubuntu-latest --all-features	2m 2s
Test stable macos-latest --no-default-features	4m 10s
Test stable macos-latest	2m 58s
Test stable macos-latest --all-features	3m 31s
Test stable windows-latest --no-default-features	3m 30s
Test stable windows-latest	4m 49s
Test stable windows-latest --all-features	4m 13s
Test beta ubuntu-latest --all-features	2m 2s
Test nightly ubuntu-latest --all-features	2m 1s
Release x86_64-unknown-linux-gnu	1m 8s
Release aarch64-unknown-linux-gnu	1m 8s
Release armv7-unknown-linux-gnueabihf	1m 10s
Release arm-unknown-linux-gnueabihf	1m 11s
Release riscv64gc-unknown-linux-gnu	1m 0s
Release x86_64-apple-darwin	1m 19s
Release aarch64-apple-darwin	2m 50s
Release x86_64-pc-windows-msvc	2m 29s
Release aarch64-pc-windows-msvc	2m 2s
	47m 7s

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