Dear memory experts!

I am running a big, but simple computation and running out of memory, but 
do not understand why.  I am pretty sure that the problem is in the 
computation of the moebius function. Below is a silly minimal example, 
together with some checks to make sure it's in moebius_function.

I would like to know how to debug this. (I am also in need of a workaround)

Martin

sage: get_memory_usage()
5512.4296875
sage: for P in posets(7):
....:     Q = P.with_bounds()
....:     x=Q.moebius_function(Q.bottom(), Q.top())
....:     
sage: get_memory_usage()
5517.24609375
sage: for P in posets(7):
....:     Q = P.with_bounds()
....:     x=Q.moebius_function(Q.bottom(), Q.top())
....:     
sage: get_memory_usage()
5521.76953125
sage: reset()
sage: get_memory_usage()
5521.76953125
sage: for P in posets(7):
....:     Q = P.with_bounds()
....:     
sage: get_memory_usage()
5522.04296875
sage: for P in posets(7):
....:     Q = P.with_bounds()
....:     
sage: get_memory_usage()
5522.30078125
sage: for P in posets(7):
....:     Q = P.with_bounds()
....:     x = Q.bottom()
....:     
sage: get_memory_usage()
5522.44140625

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