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The only easy win I see left is if Ruby had an equivalent of `HashMap::with_capacity` (or `rb_ary_new_capa` on their end), as ~3% of time is spend re-allocating a hashmap with a known size
Though this is also in the benchmark for `ActiveRecord::Base#attributes` which literally nobody calls, but is a good proxy for "I read all of the fields on this thing"
It will juice the AR benchmarks in TFB! https://github.com/TechEmpower/FrameworkBenchmarks/blob/master/frameworks/Ruby/sinatra/hello_world.rb …
Why do you say literally no one calls attributes?
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