precise_diff is wrong when using Rust library

[baubie]

• I am on the latest Pendulum version.
• I have searched the issues of this repo and believe that this is not a duplicate.

• OS version and name: Latest python3.13.3-bookworm Dockerfile
• Pendulum version: 3.1.0

Issue

First, this was not an issue running Pendulum 3.0.0 in Python 3.12. We updated to Python 3.13.3 and installed Pendulum 3.1.0 and noticed that precise_diff, when using the Rust version, returns nonsensical results whereas if we import the Python version directly, it works. Here's a simple example where we copied the _helpers.py file into a local precise_diff.py file.

Python 3.13.3 (main, May 22 2025, 18:04:33) [GCC 12.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pendulum
>>> from util.precise_diff import precise_diff  # This is just a copy paste of _helpers.py from the Pendulum repo
>>> d1 = pendulum.datetime(2025,6,2,10)
>>> d2 = pendulum.datetime(2025,6,2,13)  # Create a second datetime 3 hours later.
>>> pendulum.helpers.precise_diff(d2,d1)
PreciseDiff(years=0, months=0, days=0, hours=-13, minutes=0, seconds=0, microseconds=0, total_days=0)
>>> precise_diff(d2,d1)
0 years 0 months 0 days -3 hours 0 minutes 0 seconds 0 microseconds

As you can see, when using our local copy (that uses Python), it returns -3 hours which is what you expect. It is returning -13 hours using the built in one that appears to use the Rust code as you can confirm by the fact that the representation of PreciseDiff in each case is different.