Yue Yang

> It seems that only msys2 currently has support for ucrt (why don't they upstream it?) so we can't support it in binary builder and change the ecosystem to it....

Yes. I read the documentation of HiGHS callback recently. If I understand correctly, the capability of HiGHS callback is quite limited, we can only query some information or interrupt optimization....

It seems that user cut and lazy constraint haven't been implemented in HiGHS currently. I will leave this issue open and get back to this once HiGHS implements these features.

> Fyi, I've gotten a similar request for Gurobi from my team. https://metab0t.github.io/PyOptInterface/callback.html Callback is supported for Gurobi

I prefer to wait for the official GHA runner for Linux on ARM for reasons you have mentioned: 1. QEMU is terribly slow. 2. We cannot test it on every...

OK, I will keep this open until we can use official GHA ARM runner. By the way, I found out that ARM Linux can be run in VM on my...

The CI has supported linux aarch64 using the official arm64 runner, so I am closing it now.

In fact, this is the reason why PyOptInterface creates a new `ExprBuilder` class to use in-place mutable operations to build expressions efficiently: https://metab0t.github.io/PyOptInterface/expression.html It is much faster than ordinary linear...

@mathgeekcoder Sorry that I cannot reproduce the crash on my machine. This is the benchmark script I use to test the model construction time: Benchmark script ```python import numpy as...

@mathgeekcoder Thanks for your benchmark and improvement of highspy! PyOptInterface does not use caching and just translates each step to direct call of highs. The performance of POI is a...