Crate dupe

A cheap version of Clone.

Traits

• Dupe
  Like Clone, but should only be available if Clone is constant time and zero allocation (e.g. a few Arc bumps). The implementation of dupe should always call clone.
• IterDupedExt
• OptionDupedExt
  Extension traits on Option where it holds a ref.

Derive Macros

• Clone_
  Derive the Clone trait, but without requiring all type arguments to implement Clone.
• Copy_
  Derive the Copy trait, but without requiring all type arguments to implement Copy.
• Dupe
  Derive the Dupe trait.
• Dupe_
  Derive the Dupe trait, but without requiring all type arguments to implement Dupe.