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Changes between Initial Version and Version 1 of Ticket #39550, comment 101

initial	v1
4	4	> What we don't want to do is make `$mime_to_ext` a blanket whitelist of mime-to-extension possibilities.
5	5
6		Definitely. I'm not suggesting making `$mime_to_ext` a blanket whitelist, but the point of that particular block of code is to try and generate web-able images where it can. That doesn't apply to any file types outside `$mime_to_ext`. Because the outer check ("image/*") is looser than the inner (the `$mime_to_ext` list), anything ~~outside of that~~ will be irrevocably failed.
	6	Definitely. I'm not suggesting making `$mime_to_ext` a blanket whitelist, but the point of that particular block of code is to try and generate web-able images where it can. That doesn't apply to any file types outside `$mime_to_ext`. Because the outer check ("image/*") is looser than the inner (the `$mime_to_ext` list), anything in between will be irrevocably failed.
7	7
8	8	If an upload doesn't match the `$mime_to_ext` list, it is outside the purview of that particular challenge and should be passed down the chain to `finfo` and eventually `upload_mimes`.