v9.34.0

ModelingToolkit v9.34.0

Diff since v9.33.1

Merged pull requests:

• Add support for symbolic units by normalizing them to SI units (#2621) (@YingboMa)
• refactor: store discrete portion in BlockedArray for efficiency, better handle event variables (#2945) (@AayushSabharwal)
• Expose independent variable as a system property (#2962) (@hersle)
• Hotfix to avoid DataFrames.jl piracy (#2966) (@MasonProtter)
• AD: Add ChainRules extension for MTKParameters construction (#2977) (@DhairyaLGandhi)
• Fix parameter dependencies across model hierarchy (#2978) (@SebastianM-C)
• CompatHelper: add new compat entry for ChainRulesCore in [weakdeps] at version 1, (keep existing compat) (#2980) (@github-actions[bot])
• refactor: default to use_union = false for ODEProblems (#2983) (@AayushSabharwal)
• fix: discover parameters from parameter dependencies, fix substitute (#2984) (@AayushSabharwal)
• make LabelledArrays an extension (#2985) (@SebastianM-C)
• Update MTKLabelledArraysExt.jl (#2987) (@ChrisRackauckas)
• Fix depwarns from solve_for (#2993) (@SebastianM-C)

Closed issues:

• Support scaled SI units (#2616)
• Type piracy by DataFrames.jl causes error during SDE simplification (#2965)
• ODEProblem from ODESystem does not sub nested constants (#2969)
• Memory and Performance Problem (#2971)