fastValueForEachNullable

inline fun <T> FastIntMap<T>.fastValueForEachNullable(callback: (value: T?) -> Unit)
inline fun <T> FastStringMap<T>.fastValueForEachNullable(callback: (value: T?) -> Unit)
inline fun <K, V> FastIdentityMap<K, V>.fastValueForEachNullable(callback: (value: V?) -> Unit)