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lang-mma
Optionform is the actual implementation and the second argument version unravels to it. Consider:SetOptions[ToString, FormatType -> CForm](note that this causes some funky output effects. Reset it by replacingCFormwithOutputForm). Although the second argument does seem to take precedence over the option version. Good find. $\endgroup$SetOptions[ToString, FormatType -> CForm], but nothing funky happened.ToStringjust converts everything toCFormnormally (Mathematica 10.3 Mac OS X 10.10). Maybe I'm missing something? $\endgroup$ToStringis used. Just a preemptive warning to anyone trying that and later being confused as to why things are displaying differently from expected. $\endgroup$