Add length checks during parsing #1164

Job	Run time
hygiene	2m 56s
build (arm-unknown-linux-gnueabihf)	3m 19s
build (armv5te-unknown-linux-musleabi)	3m 11s
build (armv7-unknown-linux-musleabihf)	3m 26s
build (aarch64-unknown-linux-musl)	3m 18s
build (mips-unknown-linux-musl)	3m 56s
build (mipsel-unknown-linux-musl)	3m 9s
build (x86_64-unknown-debian-gnu)	3m 55s
build (x86_64-tpm-debian-gnu)	4m 0s
docker_buildx	10m 3s
release	0s
	41m 13s

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