✅ string.Join returns System.Int32[]

In my constructor I am getting

T desiredValue

T desiredValue

.
In this case

int[]

int[]

.
When debugging the below code:

string desiredValue;
if (typeof(T) == typeof(int[]))
{
    format = "{0} = [{1}]\n";
    desiredValue = string.Join(", ", this.desiredValue);
}

string desiredValue;
if (typeof(T) == typeof(int[]))
{
    format = "{0} = [{1}]\n";
    desiredValue = string.Join(", ", this.desiredValue);
}

I end up getting

System.Int32[]

System.Int32[]

any idea why?