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How to change OpenGL Transform Feedback attributes size / type?

I've got an openGL particle system running on the GPU using transform feedback. Some of the attributes are floating point, others are integer, but that's too much for some attributes, as HALF is ...
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OpenGL Transform Feedback output size

I'm working on a particle system using transform feedback, and I would like to know if it is possible to render to anything other than floats, like halfs, using Transform Feedback (OpenGL 3.3)? It ...