message: renamed 'structure-element-index' to 'unit-element-index'
diff: @@ -15,7 +15,7 @@ import StructureProperties from '../properties';
  export type Set = SortedArray<ElementIndex>
  /** Index into Unit.elements */
  -export type UnitIndex = { readonly '@type': 'structure-element-index' } & number
  +export type UnitIndex = { readonly '@type': 'unit-element-index' } & number
  export interface Property<T> { (location: Location): T }
  export interface Predicate extends Property<boolean> { }
  