anchor.diff:  * Numbers are <<incomparable>> to any value that is not also a number.
   
   
  -==== Booleans ====
  +==== Booleans
   
   * Intuitively, `true` and `false` are equal only to themselves, respectively.
   * Booleans are compared such that `false` is less than `true`.
   * Booleans are <<incomparable>> to any value that is not also a boolean.
   
   
  -==== Strings ====
  +==== Strings
   
   * Strings are compared in order of their Unicode code points from the start of the string to the end.
   Code points "missing" in a shorter string are considered to be less than any other code point.
  
positive.code: 
  
  [[conceptual-model]]
  === Summary of the conceptual model ===
  
  This proposal aims to simplify the conceptual model around equality, comparison, order, and grouping:
  
  
negative.code: * Two given instants `a` and `b` are equal if any only if they are of the same type and neither of them is _before_ or _after_ the other.
  
  
  ==== Durations
  
  * Two durations are equal if their components `months`, `days`, `seconds`, and `nanoseconds` are pairwise equal.
  * Durations are <<incomparable>> to any value including other durations, and can thus only be tested for equality.
  