Inconsistent video duration before and after write_videofile

[chamecall]

Steps to Reproduce the Problem

from moviepy.video.VideoClip import ColorClip
clip = ColorClip((600, 400), color=(255, 100, 0), duration=3.1, )
clip.fps = 24

clip.write_videofile("out.mp4")
loaded_clip = VideoFileClip("out.mp4")
print('difference:', loaded_clip.duration - clip.duration)

Expected Behavior

difference: 0.0

Actual Behavior

difference in durations not equal to zero and differs depending on source duration.
for this exact example I have the following:

difference: -0.020000000000000018

Specifications

• Python Version: Python 3.10.0
• MoviePy Version: any of (1.0.3, 2.0.0.dev1, 2.0.0.dev2)
• Platform Name: Windows
• Platform Version: 10

[chamecall]

I checked saved video duration using ffprobe and it has the same duration like after repeated moviepy load so it appears that duration changes during saving not loading