Fixes Cost.__add__ returning references#244
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maxnus wants to merge 1 commit intoBurnySc2:developfrom
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This caused a bug for me that took very long to find:
In
Cost.__add__we return the other cost object if the first one is(0, 0)- by reference! This should at least return a copy, but really we don't need this micro optimization here, so I removed the clauses.I also fixed the time sign in
__sub__.