VIDEO-005: add full offline QPSK IQ video receiver

protocol/video004_viterbi.py

@@ -6,6 +6,8 @@
 
 from __future__ import annotations
 
+from typing import Any, Callable, cast
+
 import numpy as np
 
 from protocol import convolutional_fec, punctured_fec
@@ -54,8 +56,12 @@ def _trellis(soft_values: np.ndarray, information_bit_count: int,
     return decoded[:information_bit_count]
 
 
-COMPILED_TRELLIS = (njit(cache=False, nogil=True, fastmath=False)(_trellis)
-                    if njit is not None else None)
+_compiler = cast(Any, njit)  # У Numba нет точной типизации фабрики декоратора.
+COMPILED_TRELLIS: Callable[[np.ndarray, int, np.ndarray, np.ndarray], np.ndarray] | None = (
+    cast(Callable[[np.ndarray, int, np.ndarray, np.ndarray], np.ndarray],
+         _compiler(cache=False, nogil=True, fastmath=False)(_trellis))
+    if njit is not None else None
+)
 
 
 def decode_soft(soft_values: np.ndarray, information_bit_count: int,