message: Simplify PartialEq for FrozenValue
  Summary: Less code and more reuse of what we do for Eq on Value.
diff: @@ -104,9 +104,7 @@ impl<'v> PartialEq for Value<'v> {
  impl PartialEq for FrozenValue {
  fn eq(&self, other: &FrozenValue) -> bool {
  - let v: Value = Value::new_frozen(*self);
  - let other: Value = Value::new_frozen(*other);
  - v.equals(other).ok() == Some(true)
  + self.to_value().eq(&other.to_value())
  }
  }
  