When having a branch which has a remote tracking branch containing a hash sign (like features/#123), git will store it in the config file surrounded with quotes. Now, when requesting the branch's tracking branch with Head(...).tracking_branch(), it doesn't remove the quotes and returns something like origin/"refs/heads/feature#123".

Example .git/config file:

[core]
	repositoryformatversion = 0
	filemode = true
	bare = false
	logallrefupdates = true
	ignorecase = true
	precomposeunicode = true
[remote "origin"]
	url = /var/folders/n8/s89552kd2s9_v1lcgbgwl07r0000gn/T/PyGitUp.2r0xiioq/master.issue-55/.git
	fetch = +refs/heads/*:refs/remotes/origin/*
[branch "feature#123"]
	remote = origin
	merge = "refs/heads/feature#234"

Reported in msiemens/PyGitUp#55