gem install ignores git sources in Gemfile

I'm having a problem or would like to suggest a feature.

My current problem is gem install ignores git sources in Gemfile

This issue is related to:

• Network problems
• Installing a library
• Publishing a library
• The command line gem
• Other

Here are my current environment details:

$ gem env version
3.0.6

Gemfile:

gem 'rspec', github: 'rspec'

gem i -g installs rspec but the latest version available on rubygems.org, not the one on github.

gem i -g output:

Fetching rspec-support-3.9.0.gem
Fetching rspec-core-3.9.0.gem
Fetching rspec-mocks-3.9.0.gem
Fetching rspec-expectations-3.9.0.gem
Fetching rspec-3.9.0.gem
Installing rspec-support (3.9.0)
Installing rspec-core (3.9.0)
Using diff-lcs (1.3)
Installing rspec-expectations (3.9.0)
Installing rspec-mocks (3.9.0)
Installing rspec (3.9.0)

At the moment version in the repository is 3.10.0.pre.

I will abide by the code of conduct.

Reproduce the behavior with the shown Gemfile entry and the gem i -g command, comparing the installed version with the repository version linked in lib/rspec/version.rb. Trace how gem install handles the Gemfile's GitHub source; done means the command installs the requested Git source rather than the latest RubyGems release.