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It's not rare for structs to have additional ivars, hence are one of the most common, if not the most common type in the `gen_fields_tbl`. This can cause Ractor contention, but even in single ractor mode means having to do a hash lookup to access the ivars, and increase GC work. Instead, unless the struct is perfectly right sized, we can store a reference to the associated IMEMO/fields object right after the last struct member. ``` compare-ruby: ruby 3.5.0dev (2025-08-06T12:50:36Z struct-ivar-fields-2 9a30d141a1) +PRISM [arm64-darwin24] built-ruby: ruby 3.5.0dev (2025-08-06T12:57:59Z struct-ivar-fields-2 2ff3ec237f) +PRISM [arm64-darwin24] warming up..... | |compare-ruby|built-ruby| |:---------------------|-----------:|---------:| |member_reader | 590.317k| 579.246k| | | 1.02x| -| |member_writer | 543.963k| 527.104k| | | 1.03x| -| |member_reader_method | 213.540k| 213.004k| | | 1.00x| -| |member_writer_method | 192.657k| 191.491k| | | 1.01x| -| |ivar_reader | 403.993k| 569.915k| | | -| 1.41x| ``` Co-Authored-By: Étienne Barrié <etienne.barrie@gmail.com>