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Using deepcopy() caused a major performance regression. Turns out we can work with a shallow copy as long as we force the recreation of any list that we change, effectively a poor mans CoW. This isn't too invasive and avoids the huge overhead of deepcopy so this seems like the best way to have performance and a working data store. (Bitbake rev: 32dff4749c32f32e947c42c86f8357b8b607354b) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>