chore(json-abi): avoid unsafe, remove unused generics (#229) #718

Job	Run time
docs	48s
feature checks	4m 0s
clippy	1m 6s
fmt	15s
check WASM	29s
test stable --no-default-features	1m 30s
test stable	1m 31s
test stable --all-features	1m 36s
test beta --no-default-features	1m 44s
test beta	1m 47s
test beta --all-features	1m 53s
test nightly --no-default-features	2m 42s
test nightly	2m 33s
test nightly --all-features	2m 49s
test 1.65 --no-default-features	3m 45s
test 1.65	3m 37s
test 1.65 --all-features	4m 4s
	36m 9s

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