Don't parse 'ah' as a hex number #837

Job	Run time
docker-master	1h 29m 5s
publish-standalone-dry-run	19s
test-standalone (master, dev, default)	1m 19s
build-wasm-of-ocaml (master, 4.14.1)	17m 28s
build-js-of-ocaml (master, 4.11.1)	5m 39s
generated-files (master)	22m 34s
standalone-haskell (master)	47m 16s
test-amd64	2h 16m 16s
validate-docker-master	3m 2s
deploy-js-wasm-of-ocaml	1m 26s
docker-check-all	1s
	5h 24m 25s

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