An issue in "for-in" statement while using splice(), pop() and shift() methods

A DESCRIPTION OF THE PROBLEM :
#Testcase:
var NISLFuzzingFunc = function(){
     var e = ["a", "b", "c"];
    for (var n in e){
        print(n < e.length);
        e.splice(n,1);
    }
};
NISLFuzzingFunc();

#Command:
./nashorn/jdk-13.0.1/bin/jjs --no-syntax-extensions=true --no-deprecation-warning=true testcase.js

#Output:
true
true
false

#Expected output:
true
true

#Description
The for-in statement is executed unexpectedly when using splice() method to update the array. There are the same situations when using method pop() and shift().