IPv6 host names are not being properly handled, which results in unhelpful error messages depending on the format used. Examples:

• git@[::ffff:8c52:7903]:go-git/go-git.git results in dial tcp: address [:22: missing ']' in address
• git@::ffff:8c52:7903:go-git/go-git.git results in dial tcp: lookup git@: no such host

This issue could be potentially tackled in two ways:

• (short-term) Adding error message highlighting that IPv6 is not supported for host names.
• (long-term) Add full support for IPv6 as host names.