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Jon writes Sam also recirculates the meme from Mark Pilgrim's "erudite reader" -- that two axes of typing, strong/weak and dynamic/static, are orthogonal. Python's interesting status in this regard may help to tease apart the issues that are currently polarizing the WSDL debate. It's not simply scripting languages versus compiled languages, I don't think.
I actually go further than that. Perl and Radio have different concepts of dates. Either the script writer needs to do the grungy and error-prone conversions to the desired SOAP encoding, or some portion of the runtime can be made aware of the desired type and take care of the administrative details. Interestingly enough, this data must come in from the "outside" precisely because both languages are dynamic and non-strongly typed.