Unnecessary Escapment Flagged but shouldn't be flagged

Yes it goes away in this one. A matter of taste I suppose.

//unnecessaryEscapment.js
//PICO v 1x86

// A is flagged as unecessary escapment
// with a yellow triangle in the right side of WEBIDE
var A="\xdb";
var B="xdb";

console.log("A= ",A);
console.log("B= ",B);
>echo(0);
A=  Û
B=  xdb
=undefined
>