Hi,

Would it be good idea to support "smart case"? I.e. do case insensitive matching if the query is all lowercase, and do the current case sensitive matching only if the query contains upper-case? This is similar to what e.g. vim and fzf does by default.

It could be enabled with e.g. _Z_SMART_CASE if there are people who don't like it.

I'll submit a PR if this sounds acceptable.