Honor min/max-fraction-digits of 0

Closes internal-13697

GitOrigin-RevId: cc0557bf58bb25d9f3991a7876c6277d33527fbc

Author: spokodev

src/style-spec/expression/definitions/number_format.ts

@@ -61,13 +61,13 @@ export default class NumberFormat implements Expression {
         }
 
         let minFractionDigits = null;
-        if (options['min-fraction-digits']) {
+        if (options['min-fraction-digits'] !== undefined) {
             minFractionDigits = context.parseObjectValue(options['min-fraction-digits'], 2, 'min-fraction-digits', NumberType);
             if (!minFractionDigits) return null;
         }
 
         let maxFractionDigits = null;
-        if (options['max-fraction-digits']) {
+        if (options['max-fraction-digits'] !== undefined) {
             maxFractionDigits = context.parseObjectValue(options['max-fraction-digits'], 2, 'max-fraction-digits', NumberType);
             if (!maxFractionDigits) return null;
         }

test/integration/expression-tests/number-format/max-fraction-digits-zero/test.json

@@ -0,0 +1,28 @@
+{
+  "expression": [
+    "number-format",
+    3.7,
+    {
+      "max-fraction-digits": ["get", "max"]
+    }
+  ],
+  "inputs": [
+    [{}, {"properties": {"max": 0}}]
+  ],
+  "expected": {
+    "compiled": {
+      "result": "success",
+      "isFeatureConstant": false,
+      "isZoomConstant": true,
+      "type": "string"
+    },
+    "outputs": ["4"],
+    "serialized": [
+      "number-format",
+      3.7,
+      {
+        "max-fraction-digits": ["number", ["get", "max"]]
+      }
+    ]
+  }
+}