Debounce with leading called twice on single invocation

[Truffula]

If a debounced function with leading: true is called only once, the provided function is called twice on the first invocation. On subsequent invocations, it is only called once, after the timeout, since timerId isn't cleared.

[cedmax]

Would you care for creating a PR? since the nature of the project is NOT to create a drop in replacement for lodash (but to provide a learning space) I'd be leaning towards removing the leading option, to be honest

[102]

#231 doesn't seem to complicate the existing solution too much, so it probably could be used

[cedmax]

thank you both 🙂