A couple of stylistic suggestions: ANSI reserves all identifiers beginning
with an underscore, so things like

 #define _curl_long_option(option)

should really have the leading underscore removed. Also, some macros are
called curl_is_xxx but others (like the above) aren't. I like the _is_
versions better because of the analogy to the standard C macros like
isupper() and isxdigit() and make it more clear what they're accomplishing.

>>> Dan

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