please specify clearly this lib does not support multiple bindings to same key

Hello,

while the effort you guys made is highly appreciated - the default behaviour of overriding bindings is not expected/standard and will render this lib unusable for a lot of projects. the problem is that most of us find out about this behaviour the hard way. please consider specifying clearly this behaviour in the readme, the collective amount of time wasted on this by people must be insane.

thanks.