PEP 781: Make ``TYPE_CHECKING`` a built-in constant

PEPs
122

Why not just use module __getattr__? Am I missing something?

Interpreter baseline:

hyperfine './bin/python3.14 -c "pass"' --warmup 10
Benchmark 1: ./bin/python3.14 -c "pass"
  Time (mean ± σ):       5.3 ms ±   0.2 ms    [User: 4.8 ms, System: 0.7 ms]
  Range (min … max):     5.2 ms …   7.5 ms    512 runs

Importing typing for TYPE_CHECKING

hyperfine './bin/python3.14 -c "from typing import TYPE_CHECKING"' --warmup 10
Benchmark 1: ./bin/python3.14 -c "from typing import TYPE_CHECKING"
  Time (mean ± σ):      11.4 ms ±   0.4 ms    [User: 10.6 ms, System: 0.8 ms]
  Range (min … max):    11.1 ms …  15.3 ms    245 runs

After this change:

hyperfine './bin/python3.14 -c "from typing import TYPE_CHECKING"' --warmup 10
Benchmark 1: ./bin/python3.14 -c "from typing import TYPE_CHECKING"
  Time (mean ± σ):       5.2 ms ±   0.2 ms    [User: 4.8 ms, System: 0.6 ms]
  Range (min … max):     5.1 ms …   7.4 ms    479 runs
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