mne.combine_evoked with equal weights returns EvokedArray with float nave

Description of the problem

In the documentation EvokedArray.nave is typed as int, but that's not what happening with mne.combine_evoked. I actually prefer nave being float, but the problem is that it yields long floating points in plots; this wasn't the case in 1.7.1.

Steps to reproduce

import mne
sample_data_folder = mne.datasets.sample.data_path()
sample_data_raw_file = sample_data_folder / "MEG" / "sample" / "sample_audvis_raw.fif"
raw = mne.io.read_raw_fif(sample_data_raw_file, verbose=False).crop(tmax=120)
events = mne.find_events(raw, stim_channel="STI 014")
event_dict = {
    "auditory/left": 1,
    "auditory/right": 2,
    "visual/left": 3,
    "visual/right": 4,
    "face": 5,
    "button": 32,
}
epochs = mne.Epochs(raw, events, tmin=-0.2, tmax=0.5, event_id=event_dict, preload=True)
mne.combine_evoked([epochs['left'].average(), epochs['right'].average()], weights='equal').plot(picks='eeg')

Link to data

No response

Expected results

nave being rounded in the plot

Actual results

Additional information

Platform Windows-11-10.0.22631-SP0 Python 3.12.7 (tags/v3.12.7:0b05ead, Oct 1 2024, 03:06:41) [MSC v.1941 64 bit (AMD64)] Executable c:\Users\User\Documents\erp.venv\Scripts\python.exe CPU Intel64 Family 6 Model 158 Stepping 10, GenuineIntel (12 cores) Memory 31.9 GB

Core ├☑ mne 1.8.0 (latest release) ├☑ numpy 2.1.2 (OpenBLAS 0.3.27 with 12 threads) ├☑ scipy 1.14.1 └☑ matplotlib 3.9.2 (backend=module://matplotlib_inline.backend_inline)

Numerical (optional) ├☑ pandas 2.2.3 └☐ unavailable sklearn, numba, nibabel, nilearn, dipy, openmeeg, cupy, h5io, h5py

Visualization (optional) ├☑ mne-qt-browser 0.6.3 ├☑ ipywidgets 8.1.5 └☐ unavailable pyvista, pyvistaqt, vtk, qtpy, ipympl, pyqtgraph, trame_client, trame_server, trame_vtk, trame_vuetify

Ecosystem (optional) └☐ unavailable mne-bids, mne-nirs, mne-features, mne-connectivity, mne-icalabel, mne-bids-pipeline, neo, eeglabio, edfio, mffpy, pybv

mne-tools / mne-python