The 'i' format unit is often used for semantically boolean values. When the parameter has a default value, in Argument clinic you should specify it twice, as Python and C values:

    closefd: int(c_default="1") = True

or

    keepends: int(py_default="False") = 0

Proposed patch adds the boolint converter which makes a conversion for you.

    closefd: boolint = True
    keepends: boolint = False