How to use the pikepdf.Object.parse function in pikepdf

def test_numbers(self):
        self.check(Object.parse('1.0'), 1)
        self.check(Object.parse('42'), 42)

def __init__(self, context):
        self.context = context
        self.log = context.log
        self.path_base = Path(context.origin).resolve()

        self.pdf_base = pikepdf.open(self.path_base)
        self.font, self.font_key = None, None

        self.pdfinfo = context.pdfinfo
        self.output_file = context.get_path('graft_layers.pdf')

        self.procset = self.pdf_base.make_indirect(
            pikepdf.Object.parse(b'[ /PDF /Text /ImageB /ImageC /ImageI ]')
        )

        self.emplacements = 1
        self.interim_count = 0