1from numpy cimport ndarray, uint8_t
2
3
4cpdef bint checknull(object val)
5cpdef bint checknull_old(object val)
6cpdef ndarray[uint8_t] isnaobj(ndarray arr)
7
8cdef bint is_null_datetime64(v)
9cdef bint is_null_timedelta64(v)
10cdef bint checknull_with_nat_and_na(object obj)
11
12cdef class C_NAType:
13    pass
14
15cdef C_NAType C_NA
16