inline fun <T : Any> JSONObject.putNullable(key: String,
                                            value: T?,
                                            write: JSONObject.(String, T) -> JSONObject) =
    if (value == null) put(key, JSONObject.NULL) else write(key, value)

/*
Overload resolution ambiguity
e: JSONObjects.kt: (19, 103): Overload resolution ambiguity: 
public open fun put(name: kotlin.String!, value: kotlin.Any!): org.json.JSONObject! defined in org.json.JSONObject
public open fun put(name: kotlin.String!, value: kotlin.Boolean): org.json.JSONObject! defined in org.json.JSONObject
*/
fun JSONObject.putNullableBoolean(key: String, value: Boolean?) = putNullable(key, value, JSONObject::put)

/*
Works fine
*/
fun JSONObject.putNullableBoolean(key: String, value: Boolean?) = putNullable(key, value) { k, v -> put(k, v) }