The set function modifies the initial object

[a1r93]

Hi,

The docs state that the set function does not modify the given initial object, but that's actually only true on the first level of depth of an object.
When setting a value of a deeply nested property, the original object gets mutated, see example below:

const flatObject = {
  some: "test",
};
const updatedFlatObject = set(flatObject, "some", "updated");
// updatedFlatObject: { "some": "updated" }
// flatObject: { "some": "test" } -> OK: the original object is not mutated
console.log(flatObject, updatedFlatObject);

const nestedObject = {
  some: {
    nested: {
      object: "test",
    },
  },
};
const updatedNestedObject = set(
  nestedObject,
  "some.nested.object",
  "updated",
);
// updatedNestedObject: {some: {"nested":{"object":"updated"}}}
// nestedObject: {some: {"nested":{"object":"updated"}}} -> NOK: the original object got mutated
console.log(updatedNestedObject, nestedObject);