...source code changes that are highly specific to Google's environment will not be contributed back to the Subversion project because as Stein says, "It would not make sense...[since]... those changes would needlessly pollute the code base with no measurable benefit for others.
This is no reason to keep the code secret, Google could publish it all, and leave it to the subversion developers to include it in main line or not. They don't have to take it if it's not useful, but they (or someone else) could use some or all of it. This approach takes those choices away.
This says either "We don't trust you to make sensible decisions." or "This isn't our real reason, but we're going to fob you off with it."
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