Ensure that loading multiple gemspecs with legacy YAML class references does not warn #6889
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Before this, you would get constant redefinition warnings on Psych::DefaultKey
Additionally, ensure the retries wont continue infinitely in the case of the ArgumentError not being caused by Marshal trying to load the undefined classes
What was the end-user or developer problem that led to this PR?
I was getting many constant redefinition warnings when attempting to load every gemspec on RubyGems.org in a single process
What is your fix for the problem, implemented in this PR?
Check for constants before defining them
Make sure the following tasks are checked