forEach returns undefined for arrays begin do not with 0

[ne3Vubeki]

Version 1.2.21
If we pass an array:

[
  1: ......
  2: ......
  ..........
]

it forEach returns 'undefined', as cycle is inserted:
for( var i = 0 .....)
Previous versions properly treated such arrays.

[caitp]

it's not super clear what you're saying, could you provide a reproduction?

[petebacondarwin]

@ne3Vubeki - Perhaps you can start by updating this Plunker to show your problem: http://plnkr.co/edit/7B9cARoiM4Ti5DFTwLxA?p=preview

[ne3Vubeki]

In principle, everything is shown:
http://plnkr.co/edit/7B9cARoiM4Ti5DFTwLxA?p=preview
The first in the log is 'undefined'

[caitp]

okay, I see. You're right, this is the behaviour that Array.prototype.forEach would have, so it makes sense for us to do the same thing. I'll submit a patch u_u