Is there a way to convert a SmallVec<A> into an A?

[sunshowers]

I have need for a variable-length array that is almost always exactly length 32 -- so I'd like to represent it as a SmallVec<[T; 32]>. I'd like to convert it to a [T; 32] without copying. It would be cool to add a method that can try doing the conversion if possible and returns the original SmallVec if it didn't work out:

fn into_array(self) -> Result<A, Self>

What do you think?

[mbrubeck]

For comparison, arrayvec has an into_inner method for this. It seems reasonable to provide the same feature for smallvec.

Note that this may not be any faster than copying, since it still needs to move the inner array in order to return it, and a move involves a memcpy.

[mbrubeck]

Fixed by #115.