Extracted initial ICodedOutputStream interface
diff --git a/src/ProtocolBuffers/ICodedOutputStream.cs b/src/ProtocolBuffers/ICodedOutputStream.cs
new file mode 100644
index 0000000..fb290eb
--- /dev/null
+++ b/src/ProtocolBuffers/ICodedOutputStream.cs
@@ -0,0 +1,84 @@
+using System;

+using Google.ProtocolBuffers.Descriptors;

+

+namespace Google.ProtocolBuffers

+{

+    public interface ICodedOutputStream

+    {

+        /// <summary>

+        /// Writes a double field value, including tag, to the stream.

+        /// </summary>

+        void WriteDouble(int fieldNumber, string fieldName, double value);

+

+        /// <summary>

+        /// Writes a float field value, including tag, to the stream.

+        /// </summary>

+        void WriteFloat(int fieldNumber, string fieldName, float value);

+

+        /// <summary>

+        /// Writes a uint64 field value, including tag, to the stream.

+        /// </summary>

+        [CLSCompliant(false)]

+        void WriteUInt64(int fieldNumber, string fieldName, ulong value);

+

+        /// <summary>

+        /// Writes an int64 field value, including tag, to the stream.

+        /// </summary>

+        void WriteInt64(int fieldNumber, string fieldName, long value);

+

+        /// <summary>

+        /// Writes an int32 field value, including tag, to the stream.

+        /// </summary>

+        void WriteInt32(int fieldNumber, string fieldName, int value);

+

+        /// <summary>

+        /// Writes a fixed64 field value, including tag, to the stream.

+        /// </summary>

+        [CLSCompliant(false)]

+        void WriteFixed64(int fieldNumber, string fieldName, ulong value);

+

+        /// <summary>

+        /// Writes a fixed32 field value, including tag, to the stream.

+        /// </summary>

+        [CLSCompliant(false)]

+        void WriteFixed32(int fieldNumber, string fieldName, uint value);

+

+        /// <summary>

+        /// Writes a bool field value, including tag, to the stream.

+        /// </summary>

+        void WriteBool(int fieldNumber, string fieldName, bool value);

+

+        /// <summary>

+        /// Writes a string field value, including tag, to the stream.

+        /// </summary>

+        void WriteString(int fieldNumber, string fieldName, string value);

+

+        /// <summary>

+        /// Writes a group field value, including tag, to the stream.

+        /// </summary>

+        void WriteGroup(int fieldNumber, string fieldName, IMessageLite value);

+

+        [Obsolete]

+        void WriteUnknownGroup(int fieldNumber, string fieldName, IMessageLite value);

+

+        void WriteMessage(int fieldNumber, string fieldName, IMessageLite value);

+        void WriteBytes(int fieldNumber, string fieldName, ByteString value);

+

+        [CLSCompliant(false)]

+        void WriteUInt32(int fieldNumber, string fieldName, uint value);

+

+        void WriteEnum(int fieldNumber, string fieldName, int value, string textValue);

+        void WriteSFixed32(int fieldNumber, string fieldName, int value);

+        void WriteSFixed64(int fieldNumber, string fieldName, long value);

+        void WriteSInt32(int fieldNumber, string fieldName, int value);

+        void WriteSInt64(int fieldNumber, string fieldName, long value);

+        void WriteMessageSetExtension(int fieldNumber, string fieldName, IMessageLite value);

+        void WriteMessageArray(int fieldNumber, string fieldName, System.Collections.IEnumerable list);

+        void WriteGroupArray(int fieldNumber, string fieldName, System.Collections.IEnumerable list);

+        void WriteArray(FieldType fieldType, int fieldNumber, string fieldName, System.Collections.IEnumerable list);

+        void WritePackedArray(FieldType fieldType, int fieldNumber, string fieldName, System.Collections.IEnumerable list);

+        void WritePackedArray(FieldType fieldType, int fieldNumber, string fieldName, int calculatedSize, System.Collections.IEnumerable list);

+        void WriteField(FieldType fieldType, int fieldNumber, string fieldName, object value);

+        void Flush();

+    }

+}
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