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Initial release. There are providers for "number" (any of the 3 CCK number fields), "nid" (CCK nodereference) and "uid" (CCK userreference). If you need more, you need to code them yourself - but it's easy to do so, and can of course be done without touching this module (just implementing the appropriate hooks).
Have a look at value_provider_content_provider_base() combined with value_provider.providers.inc for an example.
The API seems to work pretty nicely so far, which means this is mainly a bug fix release for a few edge cases.
Nevertheless, the API has been changed from uppercase function names to lowercase ones (with Views as role model) so any modules depending on the Duration API module will need to be adapted too, or they'll break. But hey, I haven't been at 1.0 still, so this can be expected.