missing const in prototypes

Hi everybody,

I'm aware changing our prototype definitions may cause existing programs 
to fail compilation, but I wonder if it is intentional we do not have 
const in the following declarations (upper case CONST added to show where):

*CONST* char *curl_pushheader_byname(struct curl_pushheaders *h, const 
char *header)
*CONST* char *curl_pushheader_bynum(struct curl_pushheaders *h, size_t num)
CURLUcode curl_url_get(const CURLU *u, CURLUPart what, *CONST* char 
**part, unsigned int flags)

In case we do not want to change them, why not saying in docs they 
should be treated as such ?

Another such case is the *data* field in struct *curl_slist*. There may 
be others, probably.

Thanks for giving an explanation and your opinion.

Patrick

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