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cimport cython
ctypedef fused double_or_object:
double
object
def increment(double_or_object x):
with nogil(double_or_object is not object):
# Same code handles both cython.double (GIL is released)
# and python object (GIL is not released).
x = x + 1
return x
increment(5.0) # GIL is released during increment
increment(5) # GIL is acquired during increment
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