docs(sort): document sort stability

Author: lislon

docs/array/sort.mdx

@@ -8,6 +8,8 @@ since: 12.1.0
 
 Given an array, return a new array sorted either by the numerical property specified in the get function or the numerical value of its items if no get function is passed. A third, and optional, argument allows you to sort in descending order instead of the default ascending order.
 
+The function preserves the original order of items with equal values.
+
 This function only supports numerical sorting. For alphabetic sorting, see the [alphabetical](./alphabetical) function.
 
 ```ts

tests/array/sort.test.ts

@@ -26,4 +26,9 @@ describe('sort', () => {
     expect(result[1]).toBe(1)
     expect(result[2]).toBe(2)
   })
+  test('sort is stable', () => {
+    const list = [2, 0, 1, 3]
+    const result = _.sort(list, () => 0)
+    expect(result).toEqual(list)
+  });
 })