GWT.create - why the ? wildcard?

I've just been caught out by a ClassCastException from GWT.create, it
turned out to be a simple copy/paste fail when writing unit tests but
it got me thinking.

How come GWT.create is defined like so -

public static <T> T create(Class<?> classLiteral) {

instead of like so -

public static <TArg, TRet extends TArg> TRet create(Class<TArg>
classLiteral) {

?

Chris

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