Consider use of `typeOf`

[binkley]

Kotlin 1.3.40 added typeOf to the standard library, which may simplify code. However, it is marked as "experimental". Reading the tea leaves, Kotlin plans to make this feature standard (non-experimental) at some point, so I presume there are some multi-platform issues for the present. My focus is JVM, so I'm satisfied with how typeOf works.

https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.reflect/type-of.html

konfig might be simplified/improved with use of typeOf.