SizeOf() shows size for non-existant instance?

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ImaginaryHuman

Hey folks. I am getting a size back from SizeOf() when using it with an empty array. For example, I have two types, used something like this:

Type MyMainType
   Field MyArray:MySubType[]       'empty array, zero size
EndType

Type MySubType
   Field MyInt:Int
   Field MyFloat:Float
   Field MyString:String
End Type

Local MyTypes:MyMainType[100]       'array of MyMainType instances
MyTypes[0]=New MyMainType       'Create an instance at index 0
Print String(SizeOf(MyTypes[0].MyArray[0]))          'Print size of instance's array element

This will print the size of the MySubType type, ie 12. Shouldn't it be printing 0? I haven't even allocated space for the `myarray` array yet. MyTypes[0].MyArray=Null. Why does SizeOf() give a size, 12, as if there is an instance of MySubType there, when there isn't? Surely it'd make more sense for it to say 0 since the array is empty?

Print String(SizeOf(MyTypes[0].MyArray)) will print 0 - ie the array is empty, but if I point SizeOf to an element in that array (e.g. [0]) shouldn't it also say 0?

Or is this how it's meant to work (why?)

Thanks for feedback.