一、Hash碰撞后的原则
当出现冲突时，保留当前仓库已有的对象；
二、冲突场景
| 已存在 | 新对象 | 结果 |
|---|---|---|
| blob | blob | commit success, lost fail |
| tree | blob | commit sucess, push fail |
| commit | blob | commit sucess, push fail |
| blob | commit | commit fail, when updating "ref" |
| blob | tree | commit fail, when create commit |
| tree | commit | commit fail, when updating "ref" |
| tree | tree | push success, reference to wrong tree |
| commit | commit | HEAD always point to old |
| commit | tree | commit fail, when create commit |
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