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<https://discuss.kotlinlang.org/t/why-is-mapwithdefault-private/26861|Why is MapWithDefault private?>
I like to use .withDefault on maps. Today I wanted to write a class containing some mapping of values and wanted to be sure every instance of such class will also define a default mapping. Example of such mapping:
mapOf(
  "w" to Gender.FEMALE,
  "m" to Gender.MALE,
  "u" to Gender.UNKNOWN
).withDefault { Gender.UNKNOWN }

The simple idea to ensure that default value for the map is always set was to use MapWithDefault as the type of my property:
val genderMapping: MapWithDefault
But both...