t / oid-info / hash-infoon commit strbuf.c: add `strbuf_insertf()` and `strbuf_vinsertf()` (5ef264d)
   1rawsz sha1:20
   2rawsz sha256:32
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   4hexsz sha1:40
   5hexsz sha256:64
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   7zero sha1:0000000000000000000000000000000000000000
   8zero sha256:0000000000000000000000000000000000000000000000000000000000000000