I also switched to "develop" branch for SCA and I think there is an error in addon/components/stripe-element.js, line 86:
this.change(stripeElement, ...args);
when I use it I get the error:
"uncaught TypeError: _this.change.apply is not a function"
Should it be called like the others
this._invokeAction('change', stripeElement, ...args)
?