Expected behavior: typing ci( with the cursor in normal mode and inside (foo) should delete foo and leave the cursor in insert mode inside the remaining ().
Actual behavior in Boostnote on OS X: nothing happens and the cursor remains in normal mode.
The same thing happens for other keys like {, [ and t (for tag)
These commands work in the Codemirror demo--except for t--just not in Boostnote. It only appears to support ci" and ci'.