@cache_readonly<EOL><INDENT>def _isnan(self):<DEDENT>
if self._can_hold_na:<EOL><INDENT>return isna(self)<EOL><DEDENT>else:<EOL><INDENT>values = np.empty(len(self), dtype=np.bool_)<EOL>values.fill(False)<EOL>return values<EOL><DEDENT>
Return if each value is NaN.