https://github.com/oracle/graal: GraalVM is an ecosystem for compiling and running applications written in multiple languages. GraalVM removes the isolation between programming languages and enables interoperability in a shared runtime. 
public interface org.graalvm.polyglot.proxy.ProxyDuration extends org.graalvm.polyglot.proxy.Proxy
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.graalvm.polyglot.proxy.ProxyDuration
  super_class: java.lang.Object
{
  public abstract java.time.Duration asDuration();
    descriptor: ()Ljava/time/Duration;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public static org.graalvm.polyglot.proxy.ProxyDuration from(java.time.Duration);
    descriptor: (Ljava/time/Duration;)Lorg/graalvm/polyglot/proxy/ProxyDuration;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // java.time.Duration duration
         0: .line 69
            new org.graalvm.polyglot.proxy.ProxyDuration$1
            dup
            aload 0 /* duration */
            invokespecial org.graalvm.polyglot.proxy.ProxyDuration$1.<init>:(Ljava/time/Duration;)V
            areturn
        end local 0 // java.time.Duration duration
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    1     0  duration  Ljava/time/Duration;
    MethodParameters:
          Name  Flags
      duration  
}
SourceFile: "ProxyDuration.java"
NestMembers:
  org.graalvm.polyglot.proxy.ProxyDuration$1
InnerClasses:
  org.graalvm.polyglot.proxy.ProxyDuration$1