The kata's premise is flawed: JS objects do not exactly follow key insertion order, but is defined as

1. Positive integer-like keys in ascending order
2. String keys in insertion order
3. Symbols in insertion order

Only Maps and Sets retain insertion order regardless of key/value types.

Needs edge case with 0 input arguments: at least 1 solution fails in this case.

Test fixture is vulnerable to input modification: https://www.codewars.com/kata/reviews/57056369006458d7e100002f/groups/6451be4d582ac90001eb585b

Duplicate of a lot of katas.