Support for sha256 object identifiers?

First, thank you for all the hard work you put in the bindings.

Second, now that the latest revisions of git, and as far as I can tell libgit2 as well, both support using sha256 for object identifiers, I am wondering how much work it would be to add this to pygit2? Is the hashing function well-encapsulated in a few places or is it a widespread assumption that sha1 is used?

If support for it did not require too much mastery over the internals of pygit2, I would be willing to take a look at it.

Cheers,

Erick

未识别出文件或测试。首先跟踪 pygit2 如何表示对象标识符，以及这些 bindings 如何依赖 libgit2 对 SHA-1 的假设。确定 SHA-256 支持是局部的还是广泛分布的；完成的标准是 pygit2 能够一致地支持 SHA-256 对象标识符。