Tweak MIP detection logic (#39)

package.json

@@ -1,6 +1,6 @@
 {
   "name": "highs-packages",
-  "version": "0.5.13",
+  "version": "0.5.14",
   "private": true,
   "repository": "github:opvious/highs.ts",
   "author": "Opvious Engineering <[email protected]>",

packages/highs-addon/package.json

@@ -1,6 +1,6 @@
 {
   "name": "highs-addon",
-  "version": "0.5.13",
+  "version": "0.5.14",
   "repository": "github:opvious/highs.ts",
   "description": "Low-level Node.js binding for the HiGHS optimization solver",
   "keywords": [

packages/highs-solver/package.json

@@ -1,6 +1,6 @@
 {
   "name": "highs-solver",
-  "version": "0.5.13",
+  "version": "0.5.14",
   "repository": "github:opvious/highs.ts",
   "description": "Node.js binding for the HiGHS optimization solver",
   "keywords": [
@@ -32,9 +32,9 @@
     "watch": "tsc -b -w src test"
   },
   "dependencies": {
-    "@opvious/stl-errors": "^0.21.8",
-    "@opvious/stl-telemetry": "^0.21.8",
-    "@opvious/stl-utils": "^0.21.8",
+    "@opvious/stl-errors": "^0.21.14",
+    "@opvious/stl-telemetry": "^0.21.14",
+    "@opvious/stl-utils": "^0.21.14",
     "highs-addon": "workspace:*",
     "tail": "^2.2.6",
     "tmp-promise": "^3.0.3"

packages/highs-solver/src/solver.ts

@@ -353,7 +353,7 @@ export class Solver {
     const info = this.delegated('getInfo');
     return {
       objectiveValue: info.objective_function_value,
-      relativeGap: info.mip_node_count > 0 ? info.mip_gap : undefined,
+      relativeGap: info.mip_node_count >= 0 ? info.mip_gap : undefined,
       primal: {rows: sol.rowValues, columns: sol.columnValues},
       dual: sol.isDualValid
         ? {rows: sol.rowDualValues, columns: sol.columnDualValues}