The trace_id should be a string.

lib/console/output/datadog/wrapper.rb

@@ -59,7 +59,7 @@ def call(subject = nil, *arguments, **options, &block)
 
 				def format_trace_id(id)
 					# 128-bit tracing is not supported by the Datadog agent, so we need to convert it to 64-bit. We expect that this will be changed in the future.
-					::Datadog::Tracing::Utils::TraceId.to_low_order(id)
+					::Datadog::Tracing::Utils::TraceId.to_low_order(id).to_s
 				end
 			end
 		end

test/console/output/datadog.rb

@@ -24,12 +24,16 @@
 	end
 
 	with "datadog trace" do
+		def correlation_trace_id(span)
+			::Datadog::Tracing::Correlation::Identifier.new(trace_id: span.trace_id).trace_id.to_s
+		end
+
 		it "should log message with datadog correlation" do
 			Datadog::Tracing.trace("frobulate.apply",service: "frobulate") do |span|
 				expect(buffer).to receive(:call).with("Hello World",
 					severity: :info,
 					dd: {
-						trace_id: ::Datadog::Tracing::Correlation::Identifier.new(trace_id: span.trace_id).trace_id,
+						trace_id: correlation_trace_id(span),
 						span_id: span.id.to_s
 					}
 				)
@@ -45,7 +49,7 @@
 				expect(buffer).to receive(:call).with("Hello World",
 					severity: :info,
 					dd: {
-						trace_id: ::Datadog::Tracing::Correlation::Identifier.new(trace_id: span.trace_id).trace_id
+						trace_id: correlation_trace_id(span)
 					}
 				)