"Shawn O. Pearce" [off-list ref] writes:
So why is it legal to omit the tagger header from a tag?
E.g. the Linux kernel tag v2.6.12 has no tagger header:
We didn't.add tagger line until c818566 ([PATCH] Update tags to record who
made them, 2005-07-14), which is v0.99.1~9
Linux 2.6.12 is a lot older than that. v2.6.13-rc4 in late July is the
first one with tagger.