{  "name": "append",  "kind": "diff",  "description": "append a line at the end",  "a_hex": "610a620a",  "b_hex": "610a620a630a",  "edits": [    {      "op": "equal",      "a": 0,      "b": 0,      "len": 2    },    {      "op": "insert",      "b": 2,      "len": 1    }  ],  "hunks": [    {      "base": [        2,        2      ],      "new": [        2,        3      ]    }  ]}