Multiword directive params pick up incorrect attribute

[simplesmiler]

Vue.js version

1.0.19

Reproduction Link

https://jsfiddle.net/simplesmiler/Lesxqn3v/2/

What is Expected?

Directive param keBab picking up value from ke-bab attribute.

What is actually happening?

Directive param keBab picks value from kebab attribute.