constructed idea of indexing context could be generalised, level-s, format-s spanning level-s unifying-conversion-and-indexing
filtration and calling functions wihch filter can cause infinite repetitive execution ( if called in a object initialisation sequence&& if the filtration process instanciates data that it filters), the coding body can query filters for this purpose. More in 2023-05-22
Indexing into a container and recording or editing a result is a common operation and would do well to have a generic implementation integrated with the indexing context-s concept