public static Object unescape(Object obj) {
    if (isEscapedScript(obj)) {
      return obj.toString().replaceFirst("\\\\\\$", "\\$");
    } else {
      return obj;
    }
  }
Removes script escape character from a string {@code "\${ ... }"} becomes {@code "${ ... }"}
planetiler-custommap/src/main/java/com/onthegomap/planetiler/custommap/expression/ConfigExpressionScript.java