Describe the bug

The igraphmodule_Graph_dominator shouldn't box its return values in Python ints. I generally prefer to use graph libraries in such a way that there's no direct relationship between the size of my data set and the number of Python heap objects I have to allocate. Additionally, the underlying C function is capable of returning three outputs (a graph and a list of nodes left out), and the Python binding ignores all of them except the dominator list.

Expected behavior

The function should have a parameter that asks it to return some kind of Python-buffer-protocol-supporting object allowing for batch extraction of the dominator list.

Current behavior

Returns list[int]

Version information

Mainline.