Your new approach looks fine. I think it would be consistent with the CLI. As side a note on the naming style in English: Options start with a hyphen and not with a dash. Both are two distinct typographic glyphs. Please see: http://en.wikipedia.org/wiki/Hyphen

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** [bugs:#1297] -u : --negotiate do not work when -K is used**
**Status:** open-confirmed
**Created:** Wed Nov 06, 2013 03:19 PM UTC by Michael Osipov
**Last Updated:** Wed Nov 06, 2013 11:08 PM UTC
**Owner:** Daniel Stenberg
I do use:
curl 7.33.0 (x86_64-unknown-linux-gnu) libcurl/7.33.0 OpenSSL/1.0.0 zlib/1.2.3
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtsp smtp smtps telnet tftp
Features: GSS-Negotiate IPv6 Largefile NTLM NTLM_WB SSL libz
Invoking a URL with:
$ curl -i -L -o /dev/null -k --negotiate -u : $URL
works as expected. Negotiate auth is performed. When I transform this to a param file and pass with -K
$  curl -K params.txt
Warning: params.txt:6: warning: '-u' requires parameter
Interestingly, if I set -u foo:bar in the param file, the download works as expected.
The -u in the params file should behave same as in the first example.
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