This avoids extracting the default value expression in more than one place, which causes inconsistencies for e.g. anonymous classes, which expect to have a single `new` expression associated.
This generates functions that omit parameters with default values, rightmost first, such that Java can achieve a similar experience to Kotlin (which represents calls internally as if the default was supplied explicitly, and/or uses a $default method that supplies the needed arguments).
A complication: combining JvmOverloads with JvmStatic means that both the companion object and the surrounding class get overloads.
