Is "style" a keyword of grunt-contrib-handlebars

Is "style" a keyword of grunt-contrib-handlebars ？  

It looks strange when I use it as follow ：

```
data : 
{style:"abc"}

template :
-{{style}}-

output:
--
```

however... 

```
data : 
{style:"abc"}

template :
-{{this.style}}-

output:
-abc-
```
