advanced patterns when using `Enumerable#partition` with a custom predicate in Ruby 3.1
I've searched everywhere and can't find a clear answer. I am working with an scenario with the `Enumerable#partition` method in Ruby 3.1 when I try to use it with a custom predicate that relies on an instance variable. The expectation is that it should split an array of objects into two arrays based on whether the predicate returns true or false, but I'm getting unexpected results. Consider the following code: ```ruby class User attr_reader :age def initialize(age) @age = age end def adult? @age >= 18 end end users = [User.new(15), User.new(22), User.new(17), User.new(30)] partitioned_users = users.partition(&:adult?) puts partitioned_users.inspect ``` I expected that `partitioned_users` would result in two arrays, where the first contains users who are adults and the second contains minors. However, I noticed that the output seems to be correct, but when I try to access the `age` property later, I get a `NoMethodError` for one of the users. After debugging, I realized that in some cases, the method `adult?` is being called on a different instance than I expected, which leads to inconsistent behavior. I've tried explicitly passing the block for partitioning: ```ruby partitioned_users = users.partition { |user| user.adult? } ``` However, the scenario continues. It seems that my instance variable might be getting overridden or not set correctly in some cases, but I need to figure out where. Is there something I might be missing in how I'm using the `partition` method, or could it be related to how Ruby handles blocks and closures in this context? Any help would be greatly appreciated! Any help would be greatly appreciated!