inline of array in LongQueue by creating a getting a reference to the

array of LongList

primitiveCollections/src/main/java/org/lucares/collections/LongList.java

@@ -669,6 +669,10 @@ public final class LongList implements Serializable, Cloneable {
 		System.arraycopy(data, 0, input, 0, size);
 		return input;
 	}
+	
+	long[] getArrayInternal() {
+		return data;
+	}
 
 	/**
 	 * Sorts the list into ascending order.

primitiveCollections/src/main/java/org/lucares/collections/MultiwayLongMerger.java

@@ -11,40 +11,43 @@ class MultiwayLongMerger {
 	static class LongQueue {
 		private static final LongQueue EMPTY = new LongQueue(LongList.of());
 
-		final LongList wrapped;
+		final long[] wrapped;
 
 		int offset = 0;
 
+		private int size;
+
 		public LongQueue(LongList wrapped) {
-			this.wrapped = wrapped;
+			this.wrapped = wrapped.getArrayInternal();
+			this.size = wrapped.size();
 		}
 
 		boolean isEmpty() {
-			return offset >= wrapped.size();
+			return offset >= size;
 		}
 
 		long pop() {
-			assert offset < wrapped.size();
+			assert offset < size;
-			final long result = wrapped.get(offset);
+			final long result = wrapped[offset];
 			offset++;
 			return result;
 		}
 
 		public long peek() {
-			return wrapped.get(offset);
+			return wrapped[offset];
 		}
 
 		public long peekLast() {
-			return wrapped.get(wrapped.size() - 1);
+			return wrapped[size - 1];
 		}
 
 		@Override
 		public String toString() {
-			return wrapped.sublist(offset).toString();
+			return Arrays.toString(Arrays.copyOfRange(wrapped, offset, size));
 		}
 
 		public int size() {
-			return wrapped.size() - offset;
+			return size - offset;
 		}
 	}