Option zipWithIndex should return an Option

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zipWithIndex (just like map) should return an Option.

This is what I expected:
val x = Some("asdf")
val y: Option[(String, Int)] = x.zipWithIndex

This is what I got:
val x = Some("asdf")
val y: Iterable[(String, Int)] = x.zipWithIndex

The docs also state this:
zipWithIndex: Option[(A, Int)]

[scabug]

Imported From: https://issues.scala-lang.org/browse/SI-8391?orig=1
Reporter: scalauserxxi (xiu)
Affected Versions: 2.10.3

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@Ichoran said:
This is a consequence of the implicit conversion from Option to a collection. Zipping with an index is a pretty non-Option-like thing to do (it's equivalent to x.map(y => (y,0))), so it's not a bug that it isn't on Option itself. Whether the implicit conversion itself is wise is another issue, but for this issue things are working as intended.

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@SethTisue said:
The ticket on the Scaladoc being wrong here is #8394.