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from collections.abc import Iterable
from typing import Any, TypeVar, Union, overload, Literal

from numpy import ndarray
from numpy._typing import DTypeLike, _SupportsArrayFunc

_ArrayType = TypeVar("_ArrayType", bound=ndarray[Any, Any])

_Requirements = Literal[
    "C", "C_CONTIGUOUS", "CONTIGUOUS",
    "F", "F_CONTIGUOUS", "FORTRAN",
    "A", "ALIGNED",
    "W", "WRITEABLE",
    "O", "OWNDATA"
]
_E = Literal["E", "ENSUREARRAY"]
_RequirementsWithE = Union[_Requirements, _E]

@overload
def require(
    a: _ArrayType,
    dtype: None = ...,
    requirements: None | _Requirements | Iterable[_Requirements] = ...,
    *,
    like: _SupportsArrayFunc = ...
) -> _ArrayType: ...
@overload
def require(
    a: object,
    dtype: DTypeLike = ...,
    requirements: _E | Iterable[_RequirementsWithE] = ...,
    *,
    like: _SupportsArrayFunc = ...
) -> ndarray[Any, Any]: ...
@overload
def require(
    a: object,
    dtype: DTypeLike = ...,
    requirements: None | _Requirements | Iterable[_Requirements] = ...,
    *,
    like: _SupportsArrayFunc = ...
) -> ndarray[Any, Any]: ...

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