v8.46.1

ModelingToolkit v8.46.1

Diff since v8.46.0

Closed issues:

• Finish pieces around DiscreteSystem (docs, DiscreteFunction, DiscreteProblemExpr) (#993)
• Simple model apparently runs out of memory (#2053)
• Incorrect Jacobian size with jac=false and sparse=true (#2064)

Merged pull requests:

• Add DiscreteFunction (#2058) (@ErikQQY)
• Faster and more robust torn_system_jacobian_sparsity (#2066) (@YingboMa)
• Add DiscreteFunctionExpr, DiscreteProblemExpr and docs (#2067) (@ErikQQY)
• Fix a cycle in dependency chasing (#2068) (@YingboMa)