Prior to
[this](https://github.com/ziglang/zig/commit/ef9966c9855dd855afda767f212abec6e5a36307#diff-08c935ef8c633bb630641d44230597f1cff5afb0e736d451e2ba5569fa53d915R805)
commit tar was not a valid extension. After that this one is valid case.