3 var callBound = require('call-bind/callBound');
4 var $boolToStr = callBound('Boolean.prototype.toString');
5 var $toString = callBound('Object.prototype.toString');
7 var tryBooleanObject = function booleanBrandCheck(value) {
15 var boolClass = '[object Boolean]';
16 var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
18 module.exports = function isBoolean(value) {
19 if (typeof value === 'boolean') {
22 if (value === null || typeof value !== 'object') {
25 return hasToStringTag && Symbol.toStringTag in value ? tryBooleanObject(value) : $toString(value) === boolClass;