Garbage collector collects live objects

[Ruslan Mullakhmetov via Digitalmars-d-learn]

On Tuesday, 9 December 2014 at 16:13:25 UTC, Dicebot wrote:
> It may happen if only reference to an object is stored in 
> memory block marked as data-only (using ubyte[] for a buffer is 
> probably most common reason I have encountered)

Thanks for interesting hypothesis, but that's not the issue.

innocent though collected objects are living in D array MyClass[] 
which are living in assoc array as value.

i checked attributes for GC block holding this array:

```
FINALIZE NO_SCAN NO_MOVE APPENDABLE NO_INTERIOR
```

I really doubting about NO_INTERIOR. can anybody confirm me that 
is's working with array slicing which i heavily use?


also i found that block size is quite small

<pre>
                 array: [100A2FD00, 100A2F700, 100A33B80, 
100A33500, 100A3FE80, 100A3F980, 100A3F400, 100A72600, 100A7DF80, 
100A7DA80, 100A7D500]
		array ptr: 100A72580 root: 100A72580:128 attr: FINALIZE NO_SCAN 
NO_MOVE APPENDABLE NO_INTERIOR
		[100985A00] keys: [1] as: 1 au: 100A2FD00
		[100985A00] keys: [1] as: 1 au: 100A2F700
		[100985A00] keys: [1] as: 1 au: 100A33B80
</pre>

array holds 11 64bit pointers but it's block size is only 128 
bytes < 11 * 64 = 704 bytes. what's wrong with this arithmetics?