At Dash, one of our developers was working with the listunspent RPC command, but instead of saying "minimumAmount" he said "minimmumAmount" as such the RPC wasn't working as expected.
In https://github.com/dashpay/dash/pull/3507 we implemented a check so that listunspent returns an error if an unrecognized option is given. I figured I might as well adapt the code and throw up a PR here.
Cheers!