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kitabcitab/node_modules/core-js-pure/internals/is-symbol.js

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+var getBuiltIn = require('../internals/get-built-in');
+var isCallable = require('../internals/is-callable');
+var isPrototypeOf = require('../internals/object-is-prototype-of');
+var USE_SYMBOL_AS_UID = require('../internals/use-symbol-as-uid');
+
+var $Object = Object;
+
+module.exports = USE_SYMBOL_AS_UID ? function (it) {
+  return typeof it == 'symbol';
+} : function (it) {
+  var $Symbol = getBuiltIn('Symbol');
+  return isCallable($Symbol) && isPrototypeOf($Symbol.prototype, $Object(it));
+};