[R] Double-banger function names: preferences and suggestions

[hadley wickham]

What do you prefer/recommend for double-banger function names:

 1 scale.colour
 2 scale_colour
 3 scaleColour

1 is more R-like, but conflicts with S3.  2 is a modern version of
number 1, but not many packages use it.  Number 3 is more java-like.
(I like number 2 best)

Any suggestions?

Thanks,

Hadley