curl: Explicit NO_PROXY /0 CIDR rules fail to bypass HTTP proxy for IP-literal requests

Summary: With an HTTP proxy configured, I found that curl sends IPv4 address-literal requests through it with NOPROXY=0.0.0.0/0, and IPv6 address-literal requests through it with NOPROXY=::/0. A zero-bit CIDR prefix should match every address in its family, so those requests should bypass the...