Write a function with the signature shown below:
```python
def is_int_array(arr):
    return True
```
* returns `true  / True`  if every element in an array is an integer or a float with no decimals.
* returns `true  / True`  if array is empty.
* returns `false / False` for every other input.
def is_int_array(arr):
    a = []
    if arr == None or arr == "":
        return False
    
    for i in arr:
        if type(i) == int:
            a.append(i)
        else:
            if type(i) == float and i.is_integer():
                a.append(i)
        
    if len(arr) == len(a):
        return True
    return False
def is_int_array(arr):
    a = []
    if arr == None or arr == "":
        return False
    
    for i in arr:
        if type(i) == int:
            a.append(i)
        else:
            if type(i) == float and i.is_integer():
                a.append(i)
        
    if len(arr) == len(a):
        return True
    return False