As of today, the helper library is not responding to the "_clear " attribute passed into the data layer array.
Existing Value --- {a: {x: undefined, y: 2}}
New Value --- {a: {x: 1}, _clear: true}
Expected Result --- {a: {x: 1}} (as per documentation)
Actual Result --- {a: {x: 1, y: 2}}
Kindly look into this or remove this feature from the readme file