modify() produces invalid JSON when removing array elements

[kmc-suzuki]

Summary

Using modify() to remove an element from an array can produce invalid JSON: string elements leave an extra " behind, and numeric elements get concatenated.

Reproduction steps

1. Create the following test.js:

const { modify, applyEdits } = require('jsonc-parser');

function case1() {
  const text = `{"items":["1","2"]}`;
  const edits = modify(text, ["items", 1], undefined, {});
  console.log('edits case1:', edits);
  console.log('result case1:', applyEdits(text, edits));
}

function case2() {
  const text = `{"items":[1,2]}`;
  const edits = modify(text, ["items", 1], undefined, {});
  console.log('edits case2:', edits);
  console.log('result case2:', applyEdits(text, edits));
}

case1();
case2();

2. Install and run:

npm init -y
npm install jsonc-parser@3.3.1
node test.js

Expected behavior

• case1 output: {"items":["1"]}
• case2 output: {"items":[1]}

Actual behavior

• case1 output: {"items":["1""]} (an extra " remains)
• case2 output: {"items":[12]} (numbers are concatenated)

Environment

• jsonc-parser: 3.3.1
• Node.js: v22.16.0
• OS: Windows 11

Additional information

• case1 edits: [{offset: 13, length: 3, content: ''}]
• case2 edits: [{offset: 11, length: 1, content: ''}]