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var isObject = require('./_is-object')
, isArray = require('./_is-array')
, SPECIES = require('./_wks')('species');
module.exports = function(original){
var C;
if(isArray(original)){
C = original.constructor;
// cross-realm fallback
if(typeof C == 'function' && (C === Array || isArray(C.prototype)))C = undefined;
if(isObject(C)){
C = C[SPECIES];
if(C === null)C = undefined;
}
} return C === undefined ? Array : C;
};
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