[pull] master from ruby:master#987
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pull[bot] merged 1 commit intoturkdevops:masterfrom May 5, 2026
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Given we only store the shape offset in ivar caches, and the offset is only 19bits, we should be able to store two shape offsets and an attribute index in a single uint64_t. Which is perfect for `setivar` caches. However when initializing caches we set them to `INVALID_SHAPE_ID` which is a full 32bits. By making `INVALID_SHAPE_ID` only as large as a shape offset we open the door to packing more information in ivar caches.
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