Don't lowercase the names of uploaded files

In <https://github.com/ckan/ckanext-b2> if someone creates or updates a resource with no name I'm getting the 'url' item out of the resource dict at validation time in resource_create and resource_update and setting this as the name. The resource name then gets used as the filename, when you download a zip file of a dataset and all its resources. I don't want to change the names of users' uploaded files to lower-case. Is there a reason these need to be lower-cased in CKAN, or can I just remove it?