During package extraction, unneeded files like .nupkg.sha512 and [Content_Types].xml are created in the packages folder

Repro steps

1. Create a Console Application
2. Install-Package jQuery.2.1.4 (Any package would work)
3. Inspect the packages folder for jQuery

Expected:
All files present are needed

Actual:
Unneeded files like .nupkg.sha512 and [Content_Types].xml are created in the packages folder