[swift-evolution] Extend FloatingPoint with tau!

[David Hart]

Hello community,

Tau day <http://tauday.com/> was yesterday, and reminded me that we forgot to provide a `tau` next to `FloatingPoint`’s `pi` property. How about we write a proposal to brind this forward-thinking constant to a forward-thinking language?

Proposal: Extend `FloatingPoint` with tau

  /// The mathematical constant tau = 6.28318...
  ///
  /// Extensible floating-point types might provide additional APIs to obtain
  /// this value to caller-specified precision.
  static var tau: Self { get } 

David.
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