fix: properly handle rational functions in HomotopyContinuation #923

Job	Run time
Tests (1, Downstream) / Tests - Downstream	10m 22s
Tests (1, Extended) / Tests - Extended	7m 18s
Tests (1, Extensions) / Tests - Extensions	16m 2s
Tests (1, InterfaceI) / Tests - InterfaceI	25m 23s
Tests (1, InterfaceII) / Tests - InterfaceII	19m 27s
Tests (1, Initialization) / Tests - Initialization	12m 14s
Tests (1, RegressionI) / Tests - RegressionI	6m 40s
Tests (1, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	8m 14s
Tests (lts, Downstream) / Tests - Downstream	8m 29s
Tests (lts, Extended) / Tests - Extended	7m 20s
Tests (lts, Extensions) / Tests - Extensions	19m 12s
Tests (lts, Initialization) / Tests - Initialization	12m 16s
Tests (lts, InterfaceI) / Tests - InterfaceI	22m 29s
Tests (lts, InterfaceII) / Tests - InterfaceII	16m 24s
Tests (lts, RegressionI) / Tests - RegressionI	4m 47s
Tests (lts, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	7m 58s
Tests (pre, Downstream) / Tests - Downstream	9m 10s
Tests (pre, Extended) / Tests - Extended	7m 23s
Tests (pre, Extensions) / Tests - Extensions	23m 18s
Tests (pre, Initialization) / Tests - Initialization	12m 30s
Tests (pre, InterfaceI) / Tests - InterfaceI	26m 3s
Tests (pre, InterfaceII) / Tests - InterfaceII	17m 22s
Tests (pre, RegressionI) / Tests - RegressionI	4m 17s
Tests (pre, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	8m 1s
	5h 12m 39s

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