fix: fix nonnumeric parameters in `@mtkmodel` #832

Job	Run time
Tests (1, Downstream) / Tests - Downstream	8m 2s
Tests (1, Extended) / Tests - Extended	6m 38s
Tests (1, Extensions) / Tests - Extensions	20m 17s
Tests (1, InterfaceI) / Tests - InterfaceI	29m 16s
Tests (1, InterfaceII) / Tests - InterfaceII	16m 21s
Tests (1, RegressionI) / Tests - RegressionI	5m 48s
Tests (1, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	7m 51s
Tests (lts, Downstream) / Tests - Downstream	10m 18s
Tests (lts, Extended) / Tests - Extended	9m 18s
Tests (lts, Extensions) / Tests - Extensions	14m 49s
Tests (lts, InterfaceI) / Tests - InterfaceI	28m 2s
Tests (lts, InterfaceII) / Tests - InterfaceII	17m 28s
Tests (lts, RegressionI) / Tests - RegressionI	6m 52s
Tests (lts, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	9m 54s
Tests (pre, Downstream) / Tests - Downstream	5m 29s
Tests (pre, Extensions) / Tests - Extensions	12m 21s
Tests (pre, Extended) / Tests - Extended	4m 12s
Tests (pre, InterfaceI) / Tests - InterfaceI	25m 24s
Tests (pre, InterfaceII) / Tests - InterfaceII	13m 12s
Tests (pre, RegressionI) / Tests - RegressionI	1m 2s
Tests (pre, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	4m 54s
	4h 17m 28s

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