Fix incorrect size computation in SlicedByteArray.

Corrected the `size` property to return the full `length` instead of subtracting the offset. Updated the project version to 0.2.9 to reflect this fix.

build.gradle.kts

@@ -6,7 +6,7 @@ plugins {
 }
 
 group = "nl.astraeus"
-version = "0.2.8"
+version = "0.2.9"
 
 repositories {
     mavenCentral()

src/commonMain/kotlin/nl/astraeus/tba/SlicedByteArray.kt

@@ -6,7 +6,7 @@ class SlicedByteArray(
   val length: Int
 ) {
   val size: Int
-    get() = length - offset
+    get() = length
 
   constructor(array: ByteArray) : this(array, 0, array.size)