Support for IsArray

[haejunejung]

It provides support for IsArray.

It allows you to accurately determine if a type is an array or not. This helps in distinguish between array and non-array types. By ensuring that a type is an array before performing operations, It helps prevent runtime erros and enhances code reliability.

For example as below.

type T0 = IsArray<[]> // true
type T1 = IsArray<readonly []> // true
type T2 = IsArray<number[]> // true

type T3 = IsArray<{}> // false
type T4 = IsArray<Record<number, any>> // false