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Refactor CDF access so that size is always statically known - #2673
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While removing explicit slices for CDF access, it was shown that some were not ordered by size in
CDFContext. This violates the invariant introduced in PR #2664, to guarantee non-overlapping writes at rollback. This change ensures that the invariant holds.As the CDF expressions passed to
symbol_with_update!all become mutable references to arrays, we can specialisesymbol_with_update()for small numbers of CDF symbols. This yields a speed-up on the order of 1.5%.