- no caching on stored delegates, fix problens with memory storage connections

+ optStored now properly load/store only non-null values
* possible concurrent modification in KVStorage.clear fixed

src/commonTest/kotlin/bipack/StorageTest.kt

@@ -0,0 +1,44 @@
+package bipack
+
+import net.sergeych.bintools.*
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertNull
+
+class StorageTest {
+    @Test
+    fun storageTest3() {
+        val s1 = MemoryKVStorage()
+        val s2 = defaultNamedStorage("test_mp_bintools2")
+        s2.clear()
+
+        s1.write("foo", "bar")
+        s1.write("foo2", "bar2")
+
+        s2.write("foo", "foobar")
+        s2.write("bar", "buzz")
+        s2.write("reason", 42)
+
+        assertEquals("bar", s1.read("foo"))
+        assertEquals("bar2", s1.read("foo2"))
+        assertNull(s1.get("bar"))
+
+        val reason: Int? by s1.optStored()
+        assertNull(s1.get("reason"))
+        assertNull(reason)
+
+        s1.connectToStorage(s2)
+
+        // s1 overwrites s2!
+        assertEquals("bar", s1.read("foo"))
+
+        // don't change
+        assertEquals("bar2", s1.read("foo2"))
+
+        // pull from s1
+        assertEquals("buzz", s1.read("bar"))
+
+        assertEquals(42, s1.read("reason"))
+        assertEquals(42, reason)
+    }
+}