faster preprocessing: before applying a step, test if it is applicable (normalization of binders, unfolding of abs/min/max definitions, lambda lifting, explicit application, monomorphization),
custom-made (top-down) atomize_conv,
store predicate and function symbols in a table instead of a list for faster lookup,
updated certificates
(benchmark Isabelle
:assumption (not (= (bvmul bv7[8] bv3[8]) bv21[8]))
:formula true
)