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Changes between Initial Version and Version 1 of Ticket #13447, comment 33

initial	v1
9	9	* I removed the custom refcounting. But there were tests using the custom refcounters. The original tests demonstrated that the underlying c-data (the libsingular ring) is properly deleted. I replaced them by tests showing that the `MPolynomialRing_libsingular` get garbage collected. Is that OK from your point of view?
10	10
11		* The mentioned tests will ''only'' work with #715 and #11521, because they are responsible for making polynomial rings garbage collectable. Hence, #13477 and #715 and #11521 need to be merged together; just having #715 and #11521 would result in the OS X problem we encountered, and #13447 alone would have two failing tests.
	11	* The mentioned tests will ''only'' work with #715 and #11521, because they are responsible for making polynomial rings garbage collectable. Hence, #13447 and #715 and #11521 need to be merged together; just having #715 and #11521 would result in the OS X problem we encountered, and #13447 alone would have two failing tests.
12	12
13	13	* #13145 has already been merged in sage-5.4.beta1. I suggest to unmerge it, because it uses the old unreliable "double refcount" approach. My new patch also takes care of refcounting of plural rings.