bug: OverflowError in Ellers generator

[dennis-fink]

When using the Ellers generator, I get an OverflowError: Python integer 128 out of bounds for int8

Steps to reproduce:

from mazelib import Maze
from mazelib.generate.Ellers import Ellers
m = Maze()
m.generator = Ellers(20,20)
m.generate()

Here is the full traceback:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/dennis/projects/coding/drawrobot/.venv/lib/python3.12/site-packages/mazelib/mazelib.py", line 41, in generate
    self.grid = self.generator.generate()
                ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/dennis/projects/coding/drawrobot/.venv/lib/python3.12/site-packages/mazelib/generate/Ellers.py", line 45, in generate
    max_set_number = self._init_row(sets, r, max_set_number)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/dennis/projects/coding/drawrobot/.venv/lib/python3.12/site-packages/mazelib/generate/Ellers.py", line 68, in _init_row
    sets[row][c] = max_set_number
    ~~~~~~~~~^^^
OverflowError: Python integer 128 out of bounds for int8

[john-science]

Okay, well, I have unit tests for this that aren't recovering the bug you found. And I cannot reproduce this error immediately. So can you provide me information on how you generated this error, please?

1. What operating system, and version number?
2. What exact version of Python?
3. Did you install via PyPI.org, or did you install the code locally yourself? (If you did the install yourself, did you use Cython?)

[dennis-fink]

Okay, well, I have unit tests for this that aren't recovering the bug you found. And I cannot reproduce this error immediately. So can you provide me information on how you generated this error, please?

1. What operating system, and version number?

I have the errors on linux and on windows 11.

3. What exact version of Python?

3.12.9

5. Did you install via PyPI.org, or did you install the code locally yourself? (If you did the install yourself, did you use Cython?)

It is the latest PyPI version (0.9.16). Numpy is at version 2.2.3 (also from PyPI).

[john-science]

Well, I'm having trouble reproducing this. I can verify that it isn't the Python/NumPy version combination.

And we test this with Windows in CI:

mazelib/.github/workflows/unittests.yaml

Lines 21 to 22 in f8e7cf2

	os: [ubuntu-24.04, windows-2025, macos-15]
	python: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]

But not Windows 11.