JuliaLang/julia — pull request #8662 by StephenVavasis (2014-10-12 03:03:11+00:00)
Title: Update mathematical-operations.rst

I added a note that the updating-operators can change the type. This is implicit in the current manual, but it nonetheless threw me for a loop the first time it happened to me (this is different, e.g., from C++), so I thought it should be made explicit.