diff failed in special string

[dvlin-dev]

in "jsondiffpatch": "^0.4.1"

when i diff a and b, it is not successful.

const {diff} = require("jsondiffpatch");
const a = '[{"attr":"model","op":"in","val":["apple"]},{"attr":"version"}]'
const b = '[{"attr":"env","op":"in","val":["office"]},{"attr":"version"}]'
console.log(diff(a,b));

[
  '@@ -7,13 +7,11 @@\n' +
    ' r%22:%22\n' +
    '-model\n' +
    '+env\n' +
    ' %22,%22o\n' +
    '@@ -30,12 +30,13 @@\n' +
    ' %22:%5B%22\n' +
    '-appl\n' +
    '+offic\n' +
    ' e%22%5D%7D\n',
  0,
  2
]

but ,just change the string, successful !!

const {diff} = require("jsondiffpatch");
const a = '[{"attr":"model","op":"in","val":["apple"]},{"attr":"1"}]'
const b = '[{"attr":"env","op":"in","val":["office"]},{"attr":"version"}]'
console.log(diff(a,b));

[
  '[{"attr":"model","op":"in","val":["apple"]},{"attr":"1"}]',
  '[{"attr":"env","op":"in","val":["office"]},{"attr":"version"}]'
]