@deprecated_function<EOL>def get_default_fft_api():
return '<STR_LIT>'<EOL>
Return the preferred FFT-API library

    As of gwpy > 0.14.0|1.0.0 this always returns 'scipy'
    This is referenced to set the default methods for
    `~gwpy.timeseries.TimeSeries` methods (amongst others)

    Examples
    --------
    >>> get_default_fft_api()
    'scipy'