Perch_Verify_Uploads Case Sensitive?

Hello, according to the documentation, when using perch_verify_uploads for an image field:

Image field types (type="image") default to only accepting the mime types from the webimage group specified in the filetypes.ini file. These are images that you’d normally embed on web pages (jpg, png, gif, svg, webp).

I have a client that is having an issue submitting an image with a JPG extension, not jpg. I was just wondering if when using perch_verify_uploads are the mime types case sensitive?

Here's what I have setup in my config file for file security for this client:

define('PERCH_PARANOID', true);
define('PERCH_VERIFY_UPLOADS', true);

And this section in my filetypes.ini file:

[webimage]
image/gif
image/jpeg
image/jpg
image/png
image/svg+xml
image/webp

And the image field in my template:

<img src="<perch:content id="slide" type="image" label="Slide Image" bucket="home-slides" width="1170" height="480" crop="true"  />" alt="Slide Image"  />

I didn't use the accept attribute for my image field because the documentation said jpg is already included in the defaults.