Why isn’t DurationProtocol.*(_:_:) commutative?

[xwu (Xiaodi Wu)]

I had brought this up during review, but it wasn't addressed, so
There doesn't appear to be any difficulty in principle, just an oversight:

µPitch: add `Duration.nanoseconds(_:)`

Since we’re on the topic of omissions from these APIs, can we add the overloads that make + commutative (as Strideable already does, and thus all clock and duration types, but not instant types) as well as *? extension InstantProtocol { // Exists: public static func + (_ lhs: Self, _ rhs: Duration) -> Self // Omitted: public static func + (_ lhs: Duration, _ rhs: Self) -> Self } public protocol DurationProtocol: Comparable, AdditiveArithmetic, Sendable { // Exists: static func * (_…