org.akop.kotx.ext.collections.android.util.LruCache

getOrPut	`fun <K, V> LruCache<K, V>.getOrPut(key: K, defaultValue: () -> V): V` Gets value with specific key from the cache. If the value is not present, calls defaultValue to obtain a non-null value which is placed into the cache, then returned.
getOrPutNotNull	`fun <K, V> LruCache<K, V>.getOrPutNotNull(key: K, defaultValue: () -> V?): V?` Gets value with specific key from the cache. If the value is not present, calls defaultValue to obtain a value which is placed into the cache if not null, then returned.
keys	`fun <V> LruCache<Int, V>.keys(): IntArray` `fun <V> LruCache<Long, V>.keys(): LongArray` `fun <K, V> LruCache<K, V>.keys(): Array<K>` Returns an array containing the keys in the cache.