Description:
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On a 32-bit Leopard system (Intel Core Duo), when my SOAP server returns an unsigned long whose value is greater than 2147483647, the SoapClient interprets this value as an integer with value 2147483647.  On a 64-bit Leopard system (Intel Core 2 Duo), the SoapClient interprets the value as an integer with the correct value (whatever was in the XML from the server).
On a 32-bit Tiger (Mac OS X 10.4) system running PHP 5.2.0, it comes back from the SoapClient class as a float with the correct integer value that was sent from the server. 


Expected result:
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According to the PHP docs (and the behavior of ext/soap in 5.2.0), an integer with greater than maximum value is converted to a float.

Actual result:
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Instead of converting the unsigned long to a float and retaining the value, it remains an integer with PHP_INT_MAX value.