In case it's confusing you can do this. ;)
Type t
Global a:Int[]
Function SizeArray()
a=a[..10]
End function
End Type
t.SizeArray()
n:t=New t
n.a[0]=10
Print n.a[0] ' Result 10
Print SizeOf t.a ' Result 40 (4*10)
j:t=New t
Print j.a[0] ' Result 10
t.SizeArray() initiate the array for you.