e018: `Borrow`, `AsRef`, `Deref`: my head hurts now

Three traits which are essential for designing good, Rustic APIs.
Notes Borrow, AsRef, and Deref are a little complicated, but they're well-worth understanding. Together, they give you tools for dealing with everything from HashMap and friends to conversions involving smart pointer types to easily using String and str or Vec and slice together.
Links

• AsRef, Borrow, and Deref:
  • Borrow and AsRef in The Rust Programming Language
  • collections::borrow::Borrow
  • std::convert::AsRef
  • std::ops::Deref
• persistent data structures
• "Rust and Rest" – Arnin Roacher
• sentry-cli
• Particularly relevant previous episodes:
  • e008: Just like something else
  • e009: Composing a Rustic tune
  • e017: Point me where I need to go
  • interview::2: Raph Levien

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