My understanding is, experimental mean the behavior may change in future versions of Ruby. We can try experimental features and give a feedback to ruby-core team.
There is a release note about the refinements which was experimental feature in ruby 2.0.
However, please be aware that Refinements is still an experimental feature: we may change its specification in the future. Despite that, we would like you to play with it and give us your thoughts. Your feedback will help to forge this interesting feature. ruby-lang.org/en/news/2013/02/24/r...
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My understanding is, experimental mean the behavior may change in future versions of Ruby. We can try experimental features and give a feedback to ruby-core team.
There is a release note about the refinements which was experimental feature in ruby 2.0.