apache · seekskyworld · Jan 13, 2026
diff --git a/src/processor/dataStack.ts b/src/processor/dataStack.ts
@@ -150,8 +150,9 @@ function calculateStack(stackInfoList: StackInfo[]) {
                         stackStrategy === 'all' // single stack group
                         || (stackStrategy === 'positive' && val > 0)
                         || (stackStrategy === 'negative' && val < 0)
-                        || (stackStrategy === 'samesign' && sum >= 0 && val > 0) // All positive stack
-                        || (stackStrategy === 'samesign' && sum <= 0 && val < 0) // All negative stack
+                        // For 'samesign', 0 is not stacked.
+                        || (stackStrategy === 'samesign' && sum > 0 && val > 0) // All positive stack
+                        || (stackStrategy === 'samesign' && sum < 0 && val < 0) // All negative stack
                     ) {
                         // The sum has to be very small to be affected by the
                         // floating arithmetic problem. An incorrect result will probably

diff --git a/test/ut/jest.config.cjs b/test/ut/jest.config.cjs
diff --git a/test/ut/spec/processor/dataStack.test.ts b/test/ut/spec/processor/dataStack.test.ts