Low Level API Access
### Description & Proposal (Include problem, use cases, benefits, and/or goals) Would you consider adding low-level API's to access blobs, refs, trees, etc. directly, similar to what [GitHub has](https://developer.github.com/v3/git/)? Some programs can only work properly with low-level API access. ### Links / references GitHub Git DB API: https://developer.github.com/v3/git/
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