Namespace packages supported by default?

I notice in the changelog that 0.990 adds support for namespace packages by default.

I've been using mypy on namespace packages (jaraco, svg, backports, and others) for some time now (https://github.com/jaraco/skeleton/commit/7455f2f25310b2d778a648e45d32033ccc790946).

With the release of mypy 0.990, however, tests have started failing across all projects with namespace packages:

error: Source file found twice under different module names: "collections" and "jaraco.collections"

The change log indicates that 0.990 adds support for namespace packages by default. Annoyingly, this change has had the opposite effect for my projects. I find that I can restore functionality by adding explicit_package_bases = True to the config file (or equivalent command line). It's slightly annoying to have to add this configuration to all of my projects just to support some projects with namespace packages.

Is it possible that explicit package bases will become default in the future?

Examinez le changelog de mypy 0.990 et le comportement de la configuration explicit_package_bases. Reproduisez l’erreur de module en double avec un projet de package d’espace de noms tel que jaraco ou backports, puis déterminez le comportement par défaut attendu. Le travail sera considéré comme terminé lorsqu’un comportement par défaut aura été décidé et que le scénario de package d’espace de noms concerné fonctionnera ou sera clairement documenté.