Rewrite error messages for At::evaluate

GitOrigin-RevId: b8c05de1f6f2c39104bd47c0814c73506565e79d

Author: jtorresfabra

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

@@ -36,15 +36,15 @@ class At implements Expression {
         const array = (this.input.evaluate(ctx) as Array<Value>);
 
         if (index < 0) {
-            throw new RuntimeError(`Array index out of bounds: ${index} < 0.`);
+            throw new RuntimeError(`Array index out of bounds: negative index`);
         }
 
         if (index >= array.length) {
-            throw new RuntimeError(`Array index out of bounds: ${index} > ${array.length - 1}.`);
+            throw new RuntimeError(`Array index out of bounds: index exceeds array size`);
         }
 
         if (index !== Math.floor(index)) {
-            throw new RuntimeError(`Array index must be an integer, but found ${index} instead. Use at-interpolated to retrieve interpolated result with a fractional index.`);
+            throw new RuntimeError(`Array index must be an integer. Use at-interpolated for fractional indices`);
         }
 
         return array[index];

test/integration/expression-tests/at/basic/test.json

@@ -18,9 +18,9 @@
     },
     "outputs": [
       8,
-      {"error": "Array index out of bounds: -1 < 0."},
-      {"error": "Array index out of bounds: 4 > 2."},
-      {"error": "Array index must be an integer, but found 1.5 instead. Use at-interpolated to retrieve interpolated result with a fractional index."}
+      {"error": "Array index out of bounds: negative index"},
+      {"error": "Array index out of bounds: index exceeds array size"},
+      {"error": "Array index must be an integer. Use at-interpolated for fractional indices"}
     ],
     "serialized": [
       "number",