README says export TBVACCINE=1 hooks tbvaccine, so I expected export TBVACCINE=0 would not hook, but it did.
I think the hook should be done only if TBVACCINE is exactly 1. (but that's a breaking change...)
You are correct, we should do this. If someone set TBVACCINE to anything other than 1 to enable it, that's undocumented, and we don't have to support it.
README says
export TBVACCINE=1
hooks tbvaccine, so I expectedexport TBVACCINE=0
would not hook, but it did. I think the hook should be done only ifTBVACCINE
is exactly1
. (but that's a breaking change...)