Extents of an Iteration Space

Extents in class IterationSpace is supposed to represent the size of the iteration space within each item in the iterset.

This is apparently not true for the tests in test_enrichment_1_feec.py. For example, if I run test_massVW0 the actual size of the LHS iteration space is 6x6, whereas extents gives 3x3. I think I can retrieve the size from the block_shape attribute. However, I'd like to clarify this thing. I guess this is somewhat related to using enriched elements.

Is it a bug or, more likely, am I missing something?