Relax unboxing of number types in Otel attributes

Author: mcculls

dd-trace-core/src/main/java/datadog/trace/core/otlp/common/OtlpCommonProto.java

@@ -173,10 +173,10 @@ public static void writeAttribute(StreamingBuffer buf, int type, CharSequence ke
         writeBooleanAttribute(buf, keyUtf8, (boolean) value);
         break;
       case LONG:
-        writeLongAttribute(buf, keyUtf8, (long) value);
+        writeLongAttribute(buf, keyUtf8, ((Number) value).longValue());
         break;
       case DOUBLE:
-        writeDoubleAttribute(buf, keyUtf8, (double) value);
+        writeDoubleAttribute(buf, keyUtf8, ((Number) value).doubleValue());
         break;
       case STRING_ARRAY:
         writeStringArrayAttribute(buf, keyUtf8, (List<String>) value);
@@ -185,10 +185,10 @@ public static void writeAttribute(StreamingBuffer buf, int type, CharSequence ke
         writeBooleanArrayAttribute(buf, keyUtf8, (List<Boolean>) value);
         break;
       case LONG_ARRAY:
-        writeLongArrayAttribute(buf, keyUtf8, (List<Long>) value);
+        writeLongArrayAttribute(buf, keyUtf8, (List<? extends Number>) value);
         break;
       case DOUBLE_ARRAY:
-        writeDoubleArrayAttribute(buf, keyUtf8, (List<Double>) value);
+        writeDoubleArrayAttribute(buf, keyUtf8, (List<? extends Number>) value);
         break;
       default:
         throw new IllegalArgumentException("Unknown attribute type: " + type);
@@ -324,10 +324,10 @@ private static void writeBooleanArrayAttribute(
   }
 
   private static void writeLongArrayAttribute(
-      StreamingBuffer buf, byte[] keyUtf8, List<Long> values) {
+      StreamingBuffer buf, byte[] keyUtf8, List<? extends Number> values) {
     long[] longValues = new long[values.size()];
     for (int i = 0; i < longValues.length; i++) {
-      longValues[i] = values.get(i); // avoid repeated unboxing later
+      longValues[i] = values.get(i).longValue(); // avoid repeated unboxing later
     }
     int arraySize = 0;
     for (long longValue : longValues) {
@@ -355,7 +355,7 @@ private static void writeLongArrayAttribute(
   }
 
   private static void writeDoubleArrayAttribute(
-      StreamingBuffer buf, byte[] keyUtf8, List<Double> values) {
+      StreamingBuffer buf, byte[] keyUtf8, List<? extends Number> values) {
     int arraySize = 11 * values.size();
     int valueSize = 1 + sizeVarInt(arraySize) + arraySize;
     int keyValueSize =
@@ -368,11 +368,11 @@ private static void writeDoubleArrayAttribute(
     writeVarInt(buf, valueSize);
     writeTag(buf, 5, LEN_WIRE_TYPE);
     writeVarInt(buf, arraySize);
-    for (double value : values) {
+    for (Number value : values) {
       writeTag(buf, 1, LEN_WIRE_TYPE);
       buf.put((byte) 9);
       writeTag(buf, 4, I64_WIRE_TYPE);
-      writeI64(buf, value);
+      writeI64(buf, value.doubleValue());
     }
   }
 }