git read-tree doesn't accept tree-ish

From: Nikita Bobko <nikitabobko@gmail.com>
Date: Aug 23, 2021, 17:31 UTC
Message-ID: <CAMJzOtxMjEuAy2B3oJqOZEnipmC4OBWxhQLx_baXDHcQ1C7-+g@mail.gmail.com>

``` git init echo foo > foo git add --all git commit -m 'foo'

echo bar > foo git add --all git commit -m 'bar'

git read-tree HEAD~:foo
```
EXP: Read information about file `foo` into index
ACT: `fatal: failed to unpack tree object HEAD~:foo`

I expect it to work because manpage says that `git-read-tree` accepts `<tree-ish>`