File: overhead.py

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from cython.cimports.cpython import array
import array

a = cython.declare(array.array, array.array('i', [1, 2, 3]))
ca = cython.declare(cython.int[:], a)

@cython.cfunc
def overhead(a: cython.object) -> cython.int:
    ca: cython.int[:] = a
    return ca[0]

@cython.cfunc
def no_overhead(ca: cython.int[:]) -> cython.int:
    return ca[0]

print(overhead(a))  # new memory view will be constructed, overhead
print(no_overhead(ca))  # ca is already a memory view, so no overhead