{  "name": "prepend",  "kind": "diff",  "description": "prepend a line at the start",  "a_hex": "610a620a",  "b_hex": "7a0a610a620a",  "edits": [    {      "op": "insert",      "b": 0,      "len": 1    },    {      "op": "equal",      "a": 0,      "b": 1,      "len": 2    }  ],  "hunks": [    {      "base": [        0,        0      ],      "new": [        0,        1      ]    }  ]}