Avoid inplace modification of target boxes in detection references

[rvandeghen]

Fixes #5221

[facebook-github-bot]

Hi @rvandeghen!

Thank you for your pull request and welcome to our community.

Action Required

In order to merge any pull request (code, docs, etc.), we require contributors to sign our Contributor License Agreement, and we don't seem to have one on file for you.

Process

In order for us to review and merge your suggested changes, please sign at https://code.facebook.com/cla. If you are contributing on behalf of someone else (eg your employer), the individual CLA may not be sufficient and your employer may need to sign the corporate CLA.

Once the CLA is signed, our tooling will perform checks and validations. Afterwards, the pull request will be tagged with CLA signed. The tagging process may take up to 1 hour after signing. Please give it that time before contacting us about it.

If you have received this in error or have any questions, please contact us at cla@fb.com. Thanks!

[facebook-github-bot]

💊 CI failures summary and remediations

As of commit 4c1fb15 (more details on the Dr. CI page):

---

✅ None of the CI failures appear to be your fault 💚

---

• 8/8 broken upstream at merge base 11d903e since Jan 26

---

🚧 8 ongoing upstream failures:

These were probably caused by upstream breakages that are not fixed yet.

• cmake_windows_cpu since Jan 26 (aef9964)
  • 🔁 rerun
• binary_win_wheel_py3.9_cpu since Jan 26 (aef9964)
  • 🔁 rerun
• binary_win_conda_py3.9_cu115 since Jan 26 (aef9964)
  • 🔁 rerun
• unittest_windows_cpu_py3.7 since Jan 26 (aef9964)
  • 🔁 rerun
• binary_win_conda_py3.9_cpu since Jan 26 (aef9964)
  • 🔁 rerun
• unittest_windows_cpu_py3.8 since Jan 26 (aef9964)
  • 🔁 rerun
• binary_win_wheel_py3.9_cu115 since Jan 26 (aef9964)
  • 🔁 rerun
• unittest_windows_cpu_py3.9 since Jan 26 (aef9964)
  • 🔁 rerun

---

This comment was automatically generated by Dr. CI (expand for details).

Please report bugs/suggestions to the (internal) Dr. CI Users group.

Click here to manually regenerate this comment.

[datumbox]

@rvandeghen Thanks for the PR.

Looks like our CI is fried at the moment... It's not because of your changes.

Note that I won't be able to merge this until the CLA is signed, so please have a look at #5289 (comment). Thanks!

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks!

[datumbox]

LGTM, thanks for your contribution @rvandeghen. :)