install_cache() with memory backend is not working properly in version 0.9.4

[hlYassine]

The problem

Memory backend not working as expected.
I installed the cache using:
requests_cache.install_cache("my_cache", backend="memory", expire_after=200)

requests calls within 200sec intervall (after the first requests call) all have from_cache = False
when i switched back to persistent backend, it worked as expected.

Environment

• requests-cache version: 0.9.4
• Python version: 3.8.0
• Platform: Windows 10 Entreprise, Version 1909, OS build 18363.2212

[JWCook]

Thanks for reporting. I'll look into it.

Meanwhile, it looks like CachedSession(backend='memory') still works as expected.

[JWCook]

Fixed in master, and I'll push out another patch release for 0.9 sometime in the next couple weeks.