Initial LsPower implementation

.venv/Lib/site-packages/numpy/lib/_format_impl.pyi

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+import os
+from _typeshed import SupportsRead, SupportsWrite
+from typing import Any, BinaryIO, Final, TypeAlias, TypeGuard
+
+import numpy as np
+import numpy.typing as npt
+from numpy.lib._utils_impl import drop_metadata as drop_metadata
+
+__all__: list[str] = []
+
+_DTypeDescr: TypeAlias = list[tuple[str, str]] | list[tuple[str, str, tuple[int, ...]]]
+
+###
+
+EXPECTED_KEYS: Final[set[str]] = ...
+MAGIC_PREFIX: Final = b"\x93NUMPY"
+MAGIC_LEN: Final = 8
+ARRAY_ALIGN: Final = 64
+BUFFER_SIZE: Final = 262_144  # 1 << 18
+GROWTH_AXIS_MAX_DIGITS: Final = 21
+_MAX_HEADER_SIZE: Final = 10_000
+
+def magic(major: int, minor: int) -> bytes: ...
+def read_magic(fp: SupportsRead[bytes]) -> tuple[int, int]: ...
+def dtype_to_descr(dtype: np.dtype) -> _DTypeDescr: ...
+def descr_to_dtype(descr: _DTypeDescr) -> np.dtype: ...
+def header_data_from_array_1_0(array: np.ndarray) -> dict[str, Any]: ...
+def write_array_header_1_0(fp: SupportsWrite[bytes], d: dict[str, Any]) -> None: ...
+def write_array_header_2_0(fp: SupportsWrite[bytes], d: dict[str, Any]) -> None: ...
+def read_array_header_1_0(fp: SupportsRead[bytes], max_header_size: int = 10_000) -> tuple[tuple[int, ...], bool, np.dtype]: ...
+def read_array_header_2_0(fp: SupportsRead[bytes], max_header_size: int = 10_000) -> tuple[tuple[int, ...], bool, np.dtype]: ...
+def write_array(
+    fp: SupportsWrite[bytes],
+    array: np.ndarray,
+    version: tuple[int, int] | None = None,
+    allow_pickle: bool = True,
+    pickle_kwargs: dict[str, Any] | None = None,
+) -> None: ...
+def read_array(
+    fp: SupportsRead[bytes],
+    allow_pickle: bool = False,
+    pickle_kwargs: dict[str, Any] | None = None,
+    *,
+    max_header_size: int = 10_000,
+) -> np.ndarray: ...
+def open_memmap(
+    filename: str | os.PathLike[Any],
+    mode: str = "r+",
+    dtype: npt.DTypeLike | None = None,
+    shape: tuple[int, ...] | None = None,
+    fortran_order: bool = False,
+    version: tuple[int, int] | None = None,
+    *,
+    max_header_size: int = 10_000,
+) -> np.memmap: ...
+def isfileobj(f: object) -> TypeGuard[BinaryIO]: ...  # don't use `typing.TypeIs`