Maybe, but I quoted specific part I was replying to. TS has no impact on runtime performance of JS. Type hints in Python have no impact on runtime performance of Python (unless you try things like mypyc etc; actually, mypy provides `from mypy_extensions import i64`)
Therefore Python has no use for TS-like superset, because it already has facilities for static analysis with no bearing on runtime, which is what TS provides.
Because the python devs weren't allowed to optimize on types. They are only hints, not contracts. If they become contracts, it will get 5-10x faster. But `const` would be more important than core types.
What OP means is that they need to:
1) Add TS like language on top of Python in backwards compatible way
2) Introduce frozen/final runtime types
3) Use 1 and 2 to drive runtime optimizations
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