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I personally regard an arXiv preprint as a usual article, just not refereed. One should be able to refer to it, hence it should contain full proofs. After you put your results with full proofs on arXiv, you will be able to write a short answer to your question (not necessarily as a CW) with a reference to your preprint. This acceptable; see this answer. Of course, it would be nice to give more details than Rami in this answer did.