MAGETWO-71831: Unable to create a shipping label for a shipment with USPS

Author: viktym

app/code/Magento/Usps/Model/Carrier.php

@@ -1814,7 +1814,7 @@ protected function _formIntlShipmentRequest(\Magento\Framework\DataObject $reque
         }
 
         $xml->addChild('GrossPounds', $packagePoundsWeight);
-        $xml->addChild('GrossOunces', sprintf('%.2F', $packageOuncesWeight));
+        $xml->addChild('GrossOunces', $packageOuncesWeight);
         if ($packageParams->getContentType() == 'OTHER' && $packageParams->getContentTypeOther() != null) {
             $xml->addChild('ContentType', $packageParams->getContentType());
             $xml->addChild('ContentTypeOther ', $packageParams->getContentTypeOther());

app/code/Magento/Usps/Test/Unit/Model/CarrierTest.php

@@ -296,8 +296,7 @@ public function testFormattingFloatValuesForIntlShipmentRequest()
 
         $request->setRecipientAddressCountryCode('UK');
         $formattedValuesRegex = '(<Value>5.00<\/Value>).*';
-        $formattedValuesRegex .= '(<NetOunces>0.00<\/NetOunces>).*';
-        $formattedValuesRegex .= '(<GrossOunces>0.00<\/GrossOunces>)';
+        $formattedValuesRegex .= '(<NetOunces>0.00<\/NetOunces>)';
 
         $this->httpClient->expects($this->exactly(2))
             ->method('setParameterGet')