https://openjdk.java.net/projects/openjfx/javafx-base/: OpenJFX JavaFX
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public interface javafx.beans.value.ObservableNumberValue extends javafx.beans.value.ObservableValue<java.lang.Number>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: javafx.beans.value.ObservableNumberValue
  super_class: java.lang.Object
{
  public abstract int intValue();
    descriptor: ()I
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract long longValue();
    descriptor: ()J
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract float floatValue();
    descriptor: ()F
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract double doubleValue();
    descriptor: ()D
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
Signature: Ljava/lang/Object;Ljavafx/beans/value/ObservableValue<Ljava/lang/Number;>;
SourceFile: "ObservableNumberValue.java"