dont ignore compatibility check

[frostming]

_link_package_versions is only called by _package_versions. I guess it's safe to modify the default value here.

Fixes #1901

[techalchemy]

This is not an acceptable fix.

We ignore compatibility to allow the resolution of cross platform wheels. We have already modified this, setting it to True.

[techalchemy]

Btw @frostming if you want to look further at this there is some difference between ipython and most other packages. This works fine most of the time but we need to make the pip-tools resolver or this introspect python_requires inside the wheel — I think pip-tools is a better target but I’m not 100% sure. I just don’t want to lose all of the extra functionally

[frostming]

@techalchemy I understand that changing the flag will affect things more than python_requires check.

What about doing a filter against candidates in piptools's Resolver WRT python_requires only?

[techalchemy]

@frostming I was just looking at this, doing some testing around that now but I'd love to have this with just the related tests that fail (if i can fix it)