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node_modules/core-js/internals/is-array.js

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+'use strict';
+var classof = require('../internals/classof-raw');
+
+// `IsArray` abstract operation
+// https://tc39.es/ecma262/#sec-isarray
+// eslint-disable-next-line es/no-array-isarray -- safe
+module.exports = Array.isArray || function isArray(argument) {
+  return classof(argument) === 'Array';
+};