Pass CompressionType through compressor instead of bool isLzma2

src/SharpCompress/Common/SevenZip/SevenZipStreamsCompressor.cs

@@ -29,14 +29,15 @@ internal sealed class SevenZipStreamsCompressor(Stream outputStream)
     /// Returns a PackedStream containing folder metadata, compressed size, and CRCs.
     /// </summary>
     /// <param name="inputStream">Uncompressed data to compress.</param>
-    /// <param name="isLzma2">True for LZMA2, false for LZMA.</param>
+    /// <param name="compressionType">Compression method (LZMA or LZMA2).</param>
     /// <param name="encoderProperties">LZMA encoder properties (null for defaults).</param>
     public PackedStream Compress(
         Stream inputStream,
-        bool isLzma2,
+        CompressionType compressionType,
         LzmaEncoderProperties? encoderProperties = null
     )
     {
+        var isLzma2 = compressionType == CompressionType.LZMA2;
         encoderProperties ??= new LzmaEncoderProperties(eos: true);
 
         var outStartOffset = outputStream.Position;

src/SharpCompress/Writers/SevenZip/SevenZipWriter.cs

@@ -77,7 +77,7 @@ public partial class SevenZipWriter : AbstractWriter
         var compressor = new SevenZipStreamsCompressor(OutputStream.NotNull());
         var packed = compressor.Compress(
             progressStream,
-            isLzma2: false,
+            CompressionType.LZMA,
             sevenZipOptions.LzmaProperties
         );
         packedStreams.Add(packed);
@@ -161,7 +161,7 @@ public partial class SevenZipWriter : AbstractWriter
         var headerCompressor = new SevenZipStreamsCompressor(output);
         var headerPacked = headerCompressor.Compress(
             rawHeaderStream,
-            isLzma2: false,
+            CompressionType.LZMA,
             sevenZipOptions.LzmaProperties
         );