Added

• #3369 Expose dash.NoUpdate type
• #3371 Add devtool hook to add components to the devtool bar ui.

Fixed

• #3353 Support pattern-matching/dict ids in dcc.Loading target_components
• #3371 Fix allow_optional triggering a warning for not found input.
• #3379 Fix dcc.Graph backward compatibility with dash 2.0 for ddk.Graph
• #3373 Fix layout as list and persistence.

Changed

• #3365 Warn if dcc.Slider has more than 500 marks and use default instead.