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These self references were previously used to avoid having to check the IO_CACHE's type. However, a benchmark shows that on x86 5930k stock, the type comparison is marginally faster than the double pointer dereference. For 40 billion my_b_tell calls, the difference is .1 seconds in favor of performing the type check. (Basically there is no measurable difference) To prevent bugs from copying the structure using the equals(=) operator, and having to do the bookkeeping manually, remove these "convenience" variables.