Returns whether a value is a valid ECMAScript array index.
The maximum array index is 2^32 - 2; 2^32 - 1 is reserved and does not update an array's length.
2^32 - 2
2^32 - 1
length
Candidate numeric property key.
Whether value is an integer in the ECMAScript array-index range.
value
Returns whether a value is a valid ECMAScript array index.
The maximum array index is
2^32 - 2;2^32 - 1is reserved and does not update an array'slength.