I don't have any previous experience with caching (and I don't have tons of time to spend on this), so I'm of no help with debugging lru_cache, but this change fixes all the broken cache-related tests. <https://github.com/sympy/sympy/commit/88e0da46da7cef491ffbb10116a1f8c8732abe83> Are there any problems caused by catching KeyError here?
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