String api update #1408

Job	Run time
Ensure 'cargo fmt' has been run	5s
WASM version	2m 7s
Extract crate metadata	4s
Documentation checks	6m 23s
Minimum supported rust version	2m 1s
aarch64-unknown-linux-gnu (ubuntu-20.04)	3m 37s
arm-unknown-linux-gnueabihf (ubuntu-20.04)	3m 55s
arm-unknown-linux-musleabihf (ubuntu-20.04)	4m 4s
i686-pc-windows-msvc (windows-2019)	7m 24s
i686-unknown-linux-gnu (ubuntu-20.04)	3m 40s
i686-unknown-linux-musl (ubuntu-20.04)	3m 43s
x86_64-apple-darwin (macos-12)	4m 28s
x86_64-pc-windows-msvc (windows-2019)	5m 20s
x86_64-unknown-linux-gnu (ubuntu-20.04)	3m 38s
x86_64-unknown-linux-musl (ubuntu-20.04)	3m 32s
	54m 1s

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