support for @Unsigned fields and fox bad error of kotlinjs x is Float glitch: it returns true for integers

src/commonTest/kotlin/bintools/SmartintTest.kt

@@ -64,4 +64,5 @@ class SmartintTest {
 //        }
         }
     }
+
 }

src/commonTest/kotlin/bipack/BipackEncoderTest.kt

@@ -40,6 +40,17 @@ data class FoobarFP1(val bar: Int, val foo: Int,val other: Int = -1)
 
 class BipackEncoderTest {
 
+    @Serializable
+    data class FoobarSize(val i: Int)
+
+    @Test
+    fun testSize() {
+        println(BipackEncoder.encode(17).toDump())
+        assertEquals(1, BipackEncoder.encode(17).size)
+//        assertEquals(1, BipackEncoder.encode(FoobarSize(17)).size)
+    }
+
+
     @Test
     fun encodeSimple() {
         val a = Foobar1(42)//, "bum")
@@ -87,13 +98,34 @@ class BipackEncoderTest {
     }
 
     @Serializable
-    data class FBU(val u: UInt, val i: Int)
+    data class FBU(
+        @Unsigned
+        val u: UInt,
+        @Unsigned
+        val i: Int,
+        val k: UInt = 3u)
     @Test
     fun testByteArray() {
+//        val z = Foobar1(42)//, "bum")
+//        println(BipackEncoder.encode(z).toDump())
+
         val x = byteArrayOf(1,2,3)
-        println(BipackEncoder.encode(x).toDump())
-        println(BipackEncoder.encode("123").toDump())
-        println(BipackEncoder.encode(FBU(3u, 3)).toDump())
-//        println(BipackEncoder.encode(1U).toDump())
+        var d = BipackEncoder.encode(x)
+        println(d.toDump())
+        assertEquals(0x0c, d[0])
+
+        d = BipackEncoder.encode("123")
+        println(d.toDump())
+        assertEquals(0x0c, d[0])
+
+        val f = FBU(3u, 3)
+        d = BipackEncoder.encode(f)
+        println(d.toDump())
+        assertEquals(0x0c, d[0])
+        assertEquals(0x0c, d[1])
+        // Signed encoding despite UInt type:
+        assertEquals(0x18, d[2])
+
+        assertEquals(f, BipackDecoder.decode(d))
     }
 }