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the above example will produce:
the $size wasn't overwritten, becaus we specified extr_prefix_same, which resulted in $wddx_size being created. if extr_skip was specified, then $wddx_size wouldn't even have been created. extr_overwrite would have cause $size to have value "medium", and extr_prefix_all would result in new variables being named $wddx_color, $wddx_size, and $wddx_shape.