main/linux-pam: Is option "nullok_secure" used for something?
I was playing a little with linux-pam and pam_faillock when noticed that the option "nullok_secure" (included in https://gitlab.alpinelinux.org/alpine/aports/-/blob/master/main/linux-pam/base-auth.pamd) is not mentioned in man-page so I checked the source code and it doesn't appear too.
I also think that it should be overridden by later:
auth sufficient pam_unix.so nullok try_first_pass
Maybe this option is useful for another program.