In Ruby, we have Hash#merge, e.g. { a: 1, b: 2 }.merge({ b: 3, c: 4 }) gives { a: 1, b: 3, c: 4 }, which is typically what you want, e.g. args.merge(reset: false) to have reset set to false in the args even if present.
That's how dict.update works in python also. The other poster is saying that they don't like the + operator having the property of using the values from the right operand to update the left operand vs the clear semantics of the method call.
