read: improve handling of 0 for tombstones (#750) #544

Job	Run time
coverage	1m 7s
Build fuzz targets	1m 3s
bench	1m 10s
build (ubuntu-latest, stable)	47s
cross (i686-unknown-linux-gnu)	52s
build (ubuntu-latest, beta)	44s
features	3m 1s
build (ubuntu-latest, nightly)	42s
cross (powerpc64-unknown-linux-gnu)	54s
doc	26s
build (stable, macOS-latest)	1m 3s
msrv-read	2m 59s
msrv	2m 58s
rustfmt	11s
Run `debug_abbrev` fuzz target	5m 15s
Run `debug_aranges` fuzz target	5m 6s
Run `debug_info` fuzz target	5m 6s
Run `debug_line` fuzz target	5m 8s
Run `eh_frame` fuzz target	5m 6s
Run `eh_frame_hdr` fuzz target	5m 5s
	48m 43s

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