Some performance improvements to Poset#22

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fabioz wants to merge 4 commits intobdcht:masterfrom

Commits on Apr 22, 2020

Profiling grandalf: creating graph is slow due to Poset creating temporary objects for __eq__.
fabioz
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Fix ValueError (TODO: Must create test-case for this case and check better solution).
fabioz
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Commits on Apr 26, 2020

org.eclipse.core.resources.prefs
fabioz
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Commits on Aug 10, 2024

Update pydevproject to use python interpreter version.
fabioz
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