One thing that is incredibly frustrating about certain classes of changes is that I have to implement 90% of it to find out if it's worth it
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One thing that I find very interesting though is that this means that `attributes[:foo].value` has a signficiant performance difference from `attributes.fetch_value(:foo)` even though the definition is just https://github.com/rails/rails/blob/daf77db65d9d5e295ee3ba86605988875cb834e4/activerecord/lib/active_record/attribute_set.rb#L46-L48 … in Ruby
The reason for the difference is that `#[]` has to return a Ruby object, which Ruby will try to garbage collect -- even though I gave it a null free function, and the memory involved will outlive when Ruby thinks it does. Just adds needless GC pressure
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Cant wait to learn a bit more about that. Never heard of a null free function before.
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It just means "don't call a function"
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