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ctutils: add primitives::borrowing_sub_mask_u32/u64 - #1577
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It seems `crypto-bigint` has undergone a bit of a performance regression and these are the primitive needed to fix it.
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Oct 25, 2026
## Added - `primitives::borrowing_sub_mask_u32`/`_u64` for propagating word-sized borrow masks without per-limb `Choice` conversions (#1577)
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It seems
crypto-biginthas undergone a bit of a performance regression and these are the primitive needed to fix it.