Please add constructors for BooleanPropertyComponent and SliderPropertyComponent that use ValueWithDefault for their &valueToControl parameter.
I call these “missing” because ChoicePropertyComponent, MultiChoicePropertyComponent, and TextPropertyComponent all have alternate constructors, allowing the use of either Value or ValueWithDefault. BooleanPropertyComponent and SliderPropertyComponent, however, have only the Value forms.
Why does this matter? Aside from convenience, SliderPropertyComponent will cause an assert (in NormalisableRange::clampTo0To1), if the Value given is void, and the resulting 0 value for the member Slider is out of its range. This could happen if the Value given at construction is from ValueTree::getPropertyAsValue, but that property is empty or missing.