This line:

Instead of calling exports.clearTimeout(..), or even better, having a local identifier pointing at that function, this line is making a call that relies on resolving to the identifier on the global object.

That works OK until a lib like mine, stable-timers, comes along and replaces those global timer API methods. When using my lib, I'm getting race conditions where sometimes this line 270 throws an exception that timer._repeat is not a function.

Could we make a small tweak to timers.js to have line 290 reference a reliable internal reference for clearTimeout?