geraldalewis/coffee-script — comment on commit ef34002cb4467e186dbb7a8ef8a44d85c39c21db
File: src/lexer.coffee line 138
By geraldalewis:

I don't know... [browsers allow it](http://jashkenas.github.com/coffee-script/#try:'use%20strict'%0Adec%20%3D%2009)

I'd say you're right -- `08` and `09` should be errors as well. Though I wonder if there's a reason to allow them?