Hoarder's maintainer here! What a nice surprise seeing Hoarder on the homepage of hackernews!
I guess one small request - could the chrome/firefox extension include a way to transfer the page data from the browser, as it's being displayed to the user? (as in, transfer the entire page/html instead of the page's link). This would likely result in much better support for nasty sites like twitter and such that require credentials, etc..!
As for your request, we're tracking this in (https://github.com/hoarder-app/hoarder/issues/172), which aims to do exactly what you're asking for.
In line with with that, I would expect the login to not be case sensitive when it accepts an email.
Wikipedia has a good summary on what is valid. https://en.wikipedia.org/wiki/Email_address
From the second paragraph:
Although the standard requires the local-part to be case-sensitive,[1] it also urges that receiving hosts deliver messages in a case-independent manner,[2] e.g., that the mail system in the domain example.com treat John.Smith as equivalent to john.smith; some mail systems even treat them as equivalent to johnsmith.[3]
You'll find the footnote links at the Wikipedia article, I'm not going to paste the here. So yes, if my email address is my username, then I would expect it to work the same in uppercase or lowercase. If my username is "like an email address, but not an email address" then you make the rules for your site.