v9.42.0

ModelingToolkit v9.42.0

Diff since v9.41.0

Merged pull requests:

• feat: support observed function generation for DDEs (#3053) (@AayushSabharwal)
• feat: allow users to set array length via args in @mtkmodel (#3055) (@ven-k)
• fix: check scope when discovering variables from equations (#3072) (@AayushSabharwal)
• test: do not mark inversemodel tests as broken (#3073) (@AayushSabharwal)
• Fix duplicate text in documentation (#3080) (@cstjean)
• CompatHelper: bump compat for DiffEqCallbacks to 4, (keep existing compat) (#3082) (@github-actions[bot])
• Start rewriting programmatically generating systems docs (#3085) (@ArnoStrouwen)
• fix: promote resid_prototype using tunables (#3090) (@AayushSabharwal)
• Revert "feat: allow users to set array length via args in @mtkmodel" (#3092) (@YingboMa)

Closed issues:

• Better initial condition handling for dummy derivatives (#1830)
• Lacking Documentation for using DynamicQuantities (Unitful is still used in dev docs) (#2462)
• Symbolic arrays: NameState has no field symbolify (#2720)
• HTML for arrays of underscored-parameters is broken (#3052)
• Add ModelingToolkit.getdefault to public API (#3071)
• structural_simplify for io system can lead to input derivatives in RHS (#3078)