Commits on Aug 3, 2024

1. [WIP] subtle: breaking changes for a hypothetical v3.0 …

   This commit contains a minimal set of proposed breaking changes, as an
   alternative to trying to make additive changes which may be "subtly"
   breaking:
   
   - Add `ConstantTimeClone` trait and use it as
     `ConditionallySelectable`'s supertrait bound (alternative to dalek-cryptography#118):
     this makes it possible to implement `ConditionallySelectable` on
     heap-allocated types (fixes dalek-cryptography#94)
   - Remove `Default` bound on `CtOption::map` and `CtOption::and_then`:
     allows using these methods with types that don't impl `Default` and
     avoids potential timing sidechannels if there might be timing
     variability in `Default` types (fixes dalek-cryptography#63)

   

   tarcieri committed Aug 3, 2024
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