Bug? url.insteadOf overwrites remote.pushUrl

I've found that defining url.<base>.insteadOf overrides explicit remote.<name>.pushUrl.
On the other hand, pushInsteadOf doesn't override explicit pushUrl.
Is it a bug?

# cat .git/config
[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = github.com/klikh/Test.git 
	pushUrl = jetbrains.com/klikh/Test.git 
[url "http://"]
  insteadOf=jet

# git remote -v
origin	github.com/klikh/Test.git (fetch)
origin	http://brains.com/klikh/Test.git (push)


See also http://kerneltrap.org/mailarchive/git/2009/9/7/11264/thread - patch introducing pushInsteadOf & discussion 

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Kirill Likhodedov
JetBrains, Inc
http://www.jetbrains.com
"Develop with pleasure!"