WordPress’ API for the toolbar (or the admin bar, as it was formerly known) has changed a bit since version 3.3. Since there is no documentation in the Codex, I thought I’d make some notes here.
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One aggravating thing in the open source software world is that, unlike closed source software, when you encounter strange behavior, you can actually research and find out why that behavior was chosen. The aggravating part happens when you find out that the decisions are made arbitrarily.