Abs producing a vector data when it shouldn't

The Abs node seem to produce a vector when a scalar would be appropriate.

Reproduction steps:

- Create new Abs node.

- Create new Power node.

- Create new Value node.

- Link Power's output to Abs' input.

- Link Value's output to both inputs of Power.

- Hold down LMB on the output of Power. Notice that the Alpha slot on the main node is not grayed out.

- Hold down LMB on the output of Abs. Alpha (among others) is grayed out.

- Add a Component mask and link it to Abs. Alpha accepts the new output.