preview_time = traverse_obj(
initial_format_data, ('boss_ts', (None, 'data'), ('previewTime', 'rtime')), expected_type=float_or_none, get_all=False)
if traverse_obj(initial_format_data, ('boss_ts', 'data', 'prv'), expected_type=int_or_none):
preview_time = traverse_obj(
initial_format_data, ('boss_ts', (None, 'data'), ('previewTime', 'rtime')), expected_type=float_or_none, get_all=False)
if traverse_obj(initial_format_data, ('boss_ts', 'data', 'prv'), expected_type=int_or_none):