Mulit-line expressions are not working.

If I put this in the template:

Ok: {{ "Hello " + "World on one line" }}

Not Ok: {{ "Hello " +
"World split" }}

I get this output where the expression was not parsed for the expression split on multiple lines:

Ok: Hello World on one line
Not Ok: {{ "Hello " + "World split" }}

I'm using the latest beta version: 2.0.0-beta.0"