replace class with method in class << self to modules #3799
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What changed, and why?
Replace class with only class methods with module
extend self"Reason is that Class is too heavy for creating only class methods. As we discussed earlier a class is supposed to have both data and behavior. If the only thing you care about is behavior then ruby suggests to implement it as a module."
more details: https://www.bigbinary.com/blog/extend-self-in-ruby