at
fun Optional<JsonElement, JsonElement>.at(name: String): Optional<JsonElement, Option<JsonElement>>(source)
fun Traversal<JsonElement, JsonElement>.at(name: String): Traversal<JsonElement, Option<JsonElement>>(source)
Select a property with a name as an Option. This allows you to erase the value by setting it to None, or allows you to overwrite it by setting a new Some.