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In general a JAX value might correspond to multiple HLO values, which is why the HLO lowering represents each value as a tuple of zero or more ir.Values. However, the common case is that there is exactly one value, and almost all such lists are singletons. To reduce the number of singleton list and tuple objects allocated during MLIR lowering, instead represent singleton values as unwrapped ir.Values, and only use a tuple if there is not exactly one ir.Value backing a JAX value.