isOpaque property
bool
get
isOpaque
Whether value is the app's toString() rather than real JSON.
A value Nylo can't turn into JSON - a controller, a listener - comes
back as text like Instance of 'ScrollController', which says no more
than type does.
Implementation
bool get isOpaque {
final Object? read = value;
return read is String && read.startsWith('Instance of ');
}