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Release notes
I know I just released the last beta only five days ago, but this one changes the way that the operation query (important for lots of Version Control API code) is constructed, and should therefore get a new release. Also, those changes enable to get rid of a rather serious scalability bottleneck, which is probably also something that you might want to have. And third, the tandem release of versioncontrol_project (6.x-1.0-beta2, which sports the same kind of improvements and a few important bugfixes) depends on the changes in here.
For developers: there's a new hook in there - hook_versioncontrol_operation_constraint_info() - which enables you to add new "native" SQL constraints for the operation query. Also, hook_versioncontrol_alter_operation_constraints() has been renamed to hook_versioncontrol_operation_constraints_alter(), for naming consistency with other alter hooks.
Finally, I think that the feature set desired for an initial 6.x-1.0 release has about been reached, and I'm only keeping this beta in case some API changes are still necessary. Apart from that, this release is probably the nicest version of Version Control API to date. r0xx0rz.