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Beartype: Unbearably fast runtime type checking in Python

• sizediterable 5y ago
  > Beartype brings Rust- and C++-inspired zero-cost abstractions > Thanks to aggressive memoization and dynamic code generation at decoration time, beartype guarantees O(1) non-amortized worst-case runtime complexity with negligible constant factors. I don't think the author(s) understands what "zero-cost abstraction means". O(1) is not O(0). Also let's not forget that memoization incurs a memory cost.