curl: 37: `curl_mprintf` `%F` format specifier not consumed, causing variadic argument desynchronization

Summary docs/libcurl/curlmprintf.md documents %F as a conversion that consumes a double, alongside %f. However, parseconversion in lib/mprintf.c has no F case — it falls through to the default branch and returns without assigning an input slot. In a sequential format like "%F%s", the %s conversio...