function() {return new XMLHttpRequest()}, 
this.prototype._each.call(obj, function(pair) { if (!pair.key) return;  if (pair.value && pair.value.constructor == Array) { var values = pair.value.compact(); if (values.length < 2) pair.value = values.reduce(); else { key = encodeURIComponent(pair.key); values.each(function(value) { value = value != undefined ? encodeURIComponent(value) : ''; parts.push(key + '=' + encodeURIComponent(value)); }); return; } } if (pair.value == undefined) pair[1] = ''; parts.push(pair.map(encodeURIComponent).join('=')); }); 
      function() {return new XMLHttpRequest()},
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