🐞[BUG] - keep-sorted doesn't copy emojis correctly

Describe the bug

keep-sorted doesn't copy emojis correctly

From Code

const example = {
   apple: "🍏",
   orange: "🍊",
   banana: "🍌",
};

Results

Reproduction

https://github.com/INeedJobToStartWork/problem-repro2

System Info

System:
    OS: Windows 11 10.0.22000
    CPU: (40) x64 Intel(R) Xeon(R) CPU E5-2673 v4 @ 2.30GHz
    Memory: 16.17 GB / 31.85 GB
  Binaries:
    Node: 21.7.3 - C:\Program Files\nodejs\node.EXE
    npm: 10.8.2 - C:\Program Files\nodejs\npm.CMD
    pnpm: 9.6.0 - C:\Program Files\nodejs\pnpm.CMD
  Browsers:
    Edge: Spartan (44.22000.120.0), Chromium (127.0.2651.74)
    Internet Explorer: 11.0.22000.120

Used Package Manager

pnpm

Validations

• Follow our Code of Conduct
• Read the Contributing Guide.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A, please open a GitHub Discussion instead.
• The provided reproduction is a minimal reproducible of the bug.

Contributions

• I am willing to submit a PR to fix this issue
• I am willing to submit a PR with failing tests (actually just go ahead and do it, thanks!)

Start with the linked minimal reproduction and trace the keep-sorted processing path in this repository. Reproduce the issue with the provided emoji example, then add coverage for the observed behavior and verify that the sorted output preserves the emoji characters.