Fix deserialization of matcher and path expressions #1981

Job	Run time
check	1m 6s
test x86_64-unknown-linux-gnu (stable)	3m 14s
fuzz pica-record-ref	6m 5s
test x86_64-unknown-linux-gnu (beta)	3m 23s
fuzz pica-record-matcher	21m 18s
cross x86_64-unknown-linux-gnu (stable)	2m 49s
test x86_64-unknown-linux-gnu (nightly)	2m 35s
fuzz pica-select-query	21m 55s
cross x86_64-unknown-linux-gnu (beta)	2m 52s
fuzz pica-path	21m 15s
test x86_64-apple-darwin (stable)	3m 58s
cross x86_64-unknown-linux-gnu (nightly)	2m 49s
test x86_64-apple-darwin (beta)	5m 37s
cross x86_64-unknown-linux-musl (stable)	2m 56s
test x86_64-apple-darwin (nightly)	4m 8s
cross aarch64-unknown-linux-gnu (stable)	2m 59s
test x86_64-pc-windows-gnu (stable)	5m 26s
test i686-pc-windows-msvc (stable)	5m 2s
cross aarch64-unknown-linux-musl (stable)	3m 3s
clippy	20s
miri	1m 39s
fmt	15s
book	1m 46s
deny	34s
audit	0s
upgrades	0s
gh-pages	0s
	2h 7m 4s

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