Cargo.toml should have set
[package.metadata.docs.rs]
all-features = true
instead of just
features = [ "derive", "serde", "std" ]
This way a single search is enough to check whether bitcode itself supports a format and what feature flag is necessary to enable said format.
It took me quite a lot of time to realize, that bitcode does in fact support time.
I did not check the Cargo.toml, but rather expected the docs on docs.rs to be complete.