I've developed a small gem ecosystem and certain features will result in them depending on each other.

Does RubyGems support circular dependencies? In other words, is it safe to push gems with these specifications?

```
Gem::Specification.new 'essentials' do |gem|
  gem.add_development_dependency 'development_tools'
end

Gem::Specification.new 'development_tools' do |gem|
  gem.add_runtime_dependency 'essentials'
end

```