public Fruit ToImmutable()
{
return this.immutable = this.immutable.With(
ImmutableObjectGraph.Optional.For(this.Color),
ImmutableObjectGraph.Optional.For(this.SkinThickness));
}
internal Builder(Fruit immutable)
{
this.immutable = immutable;
this.color = immutable.Color;
this.skinThickness = immutable.SkinThickness;
}