Commits on Dec 25, 2015

1. timers: Fail early when callback is not a function …

   `setTimeout()`, `setInterval()` and `setIntermediate` currently
   throw errors when receiving non-function objects as their first
   argument, but only do so when trying to execute the callback,
   i.e. after the waited time has passed. This may complicate
   debugging when a lot of calls to `setTimeout()`/etc. are involved,
   so failing as early as possible seems like a good idea.
   
   `setTimeout()` historically ignored an falsy first
   argument, while the other functions do not and throw instead.
   This patch changes this behaviour to make all three match and
   adds remarks in the corresponding documentation.

   

   addaleax committed Dec 25, 2015
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