I guess it refers to {ENV,Module,Object,String}#freeze and #frozen. - https://ruby-doc.org/core-3.1.1/Object.html#method-i-freeze https://ruby-doc.org/core-3.1

I guess it refers to {ENV,Module,Object,String}#freeze and #frozen. - https://ruby-doc.org/core-3.1.1/Object.html#method-i-freeze https://ruby-doc.org/core-3.1.1/Object.html#method-i-freeze - https://www.rubyguides.com/2016/01/ruby-mutability/ https://www.rubyguides.com/2016/01/ruby-mutability/