This option is has been added in https://github.com/taiki-e/cargo-hack/pull/253, and useful to speed up CI, but didn't documented in readme. https://github.com/taiki-e/cargo-hack/issues/128#issuecomment-2517805940
This option is has been added in #253, and useful to speed up CI, but didn't documented in readme.
#128 (comment)