Doesn’t always match files

A client called for help on their site with a list of issues. One of them was that this plugin was not working on their site. After some investigation, I noted that wordpress (before it calculates the unique file name) converts the extension to all lower case.

So the client was uploading images with extension of JPG, which wasn’t matching the existing because WP converted the initial to jpg. This resulted in the new file getting it’s extension changed, then getting the numbers appended.

Is there a way to support this case? (If not, can I file a bug somewhere, or maybe even submit my own patch?)

Thanks.