Pure Object validation

isPureObject.js

/*isPureObject(item,strict)
	- item(any) : the target to be checked.
  - strict(boolean) : if 'true', just original Object can  pass the check.
*/
function isPureObject(item, strict) {
    if (item !== null) {
        if (typeof item === 'object' && !Array.isArray(item)) {
            if (strict) {
                if (item.__proto__.__proto__ === null) {
                    return true;
                } else {
                    return false;
                }
            } else {
                return true;
            }
        } else {
            return false;
        }
    } else {
        return false;
    }
}

see testing in JSFiddle :
https://jsfiddle.net/ShenTengTu/rghsnkct/