diff --git a/build.gradle.kts b/build.gradle.kts
index 7f190853..430fcda4 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -6,7 +6,7 @@ plugins {
     id("scientifik.publish") version "0.2.2" apply false
 }
 
-val dataforgeVersion by extra("0.1.5-dev-2")
+val dataforgeVersion by extra("0.1.5-dev-3")
 
 val bintrayRepo by extra("dataforge")
 val githubProject by extra("dataforge-core")
diff --git a/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/IOFormat.kt b/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/IOFormat.kt
index bd1e54f4..e5497365 100644
--- a/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/IOFormat.kt
+++ b/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/IOFormat.kt
@@ -79,8 +79,10 @@ inline fun buildPacketWithoutPool(headerSizeHint: Int = 0, block: BytePacketBuil
 }
 
 fun <T : Any> IOFormat<T>.writePacket(obj: T): ByteReadPacket = buildPacket { writeObject(obj) }
-//TODO Double buffer copy. fix all that with IO-2
+
+@Deprecated("Not to be used outside tests due to double buffer write")
 fun <T : Any> IOFormat<T>.writeBytes(obj: T): ByteArray = buildPacket { writeObject(obj) }.readBytes()
+@Deprecated("Not to be used outside tests due to double buffer write")
 fun <T : Any> IOFormat<T>.readBytes(array: ByteArray): T = buildPacket { writeFully(array) }.readObject()
 
 object DoubleIOFormat : IOFormat<Double>, IOFormatFactory<Double> {
diff --git a/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/TaggedEnvelopeFormat.kt b/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/TaggedEnvelopeFormat.kt
index a95b7bfb..a461d257 100644
--- a/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/TaggedEnvelopeFormat.kt
+++ b/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/TaggedEnvelopeFormat.kt
@@ -38,15 +38,15 @@ class TaggedEnvelopeFormat(
 
     override fun Output.writeEnvelope(envelope: Envelope, metaFormatFactory: MetaFormatFactory, formatMeta: Meta) {
         val metaFormat = metaFormatFactory.invoke(formatMeta, io.context)
-        val metaBytes = metaFormat.writeBytes(envelope.meta)
+        val metaBytes = metaFormat.writePacket(envelope.meta)
         val actualSize: ULong = if (envelope.data == null) {
             0u
         } else {
             envelope.data?.size ?: ULong.MAX_VALUE
         }
-        val tag = Tag(metaFormatFactory.key, metaBytes.size.toUInt() + 2u, actualSize)
+        val tag = Tag(metaFormatFactory.key, metaBytes.remaining.toUInt() + 2u, actualSize)
         writePacket(tag.toBytes())
-        writeFully(metaBytes)
+        writePacket(metaBytes)
         writeText("\r\n")
         envelope.data?.read { copyTo(this@writeEnvelope) }
         flush()
diff --git a/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/TaglessEnvelopeFormat.kt b/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/TaglessEnvelopeFormat.kt
index d3953a0c..5c4b7dae 100644
--- a/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/TaglessEnvelopeFormat.kt
+++ b/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/TaglessEnvelopeFormat.kt
@@ -37,10 +37,10 @@ class TaglessEnvelopeFormat(
 
         //Printing meta
         if (!envelope.meta.isEmpty()) {
-            val metaBytes = metaFormat.writeBytes(envelope.meta)
-            writeProperty(META_LENGTH_PROPERTY, metaBytes.size)
+            val metaBytes = metaFormat.writePacket(envelope.meta)
+            writeProperty(META_LENGTH_PROPERTY, metaBytes.remaining)
             writeText(metaStart + "\r\n")
-            writeFully(metaBytes)
+            writePacket(metaBytes)
             writeText("\r\n")
         }