fix(lru-cache, memory, mongodb, redis): return falsy values when set in storage

[patzick]

🔗 Linked issue

• no related issue, just created fix when discovered it

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

I have noticed, that values resolved as Falsy were returned as null.
This PR is adding test for the driver to check if it returns values like 0 or false and not null and replaced some of the drivers that were returning incorrect results.

As the result null is returned only when:

1. there is no value in storage
2. value in storage is null
3. value in storage is undefined

cheers :)

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[pi0]

💯 Nice fixes!

[patzick]

thanks, @pi0, I updated the missing snapshot which was skipped locally :)
After you'll merge this one I'll resolve the conflict in #321 and prepare it for merging as well!

[patzick]

hey @pi0 could we merge this? If something's missing just let me know :)

[pi0]

Sorry for delay. CI seemd to be failing i guess should be fixed now i will include this next minor version 👍🏼