Feature summary
MediaWiki search allows keywords like insource: and intitle: however these are case sensitive - intitle:banana returns pages that contain the word "banana" in the title, however Intitle:banana returns pages that have the words "intitle", "intles", or "intitled", etc anywhere in the page text and everything after the colon is apparently ignored. This should be changed so that either the whole keyword or at least the first character is case insensitive.
Use case(s) and benefits
Mobile phones frequently autocapitalise the first letter of an input and it can be fiddly to change, frustrating that you need to remember to do that and a waste of time (and potentially data) if you don't know or forget.
See also
Original request at enwiki, which contains more examples: https://en.wikipedia.org/wiki/Wikipedia:Village_pump_(idea_lab)#insource_and_similar_search_terms_allowed_to_be_capitalized?