hg-git would clone the repository down into the directory 'munger.git', then
convert it to an Hg repository for you.
If you want to clone a github repository for later pushing (or any other repository you access via ssh), you need to convert the ssh url to a format with explicit protocol prefix (mind the switch from colon to slash after the host!):
If you want to clone a github repository for later pushing (or any other repository you access via ssh), you need to convert the ssh url to a format with an explicit protocol prefix (mind the switch from colon to slash after the host!):