Don't know actually, never used a language like that. But should be easy enough to undo should one test it and end up not liking how it handles it.

Or up-arrow a bazillion time because you probably have it SOMEWHERE in the buffer, surely.

echo 'set completion-ignore-case On' >> ~/.inputrc

Yupp. Used it a lot. Both under others brand names (like in gchat and a bunch of games have used xmpp under the jood for their lobby chats).

Absolutely. Using feedly for my RSS feeds.