Wrong parameters in custom directive 1.0.27

[shenron]

Vue.js version

1.0.27

Reproduction Link

https://jsfiddle.net/gckb9mkv/1/

Steps to reproduce

Open the fiddle and check the console output

What is Expected?

Same code but with 1.0.26 dependencies.
https://jsfiddle.net/qjvz0p1x/

// p1:Array[2]
// p2:Array[0]
// p3:"toto"

What is actually happening?

// p1:"a,b"
// p2:true
// p3:"toto"

[posva]

Thanks for reporting this. This is actually a duplicate of #3768