what is the value of an "update or insert" call on `Map`? is that not just set?

`getOrInsert` here seems to be the Python "set_default" method on dicts, which is very useful at avoiding tedium in some basic data munging

> what is the value of an "update or insert" call on `Map`?

It gives a caller the option of alternate logic based on the existence, or lack thereof, of a value.

> is that not just set?

No. The semantics of a "set" operation would overwrite an existing entry (if one exists).