in typehints/pyboard/pyb.pyi [0:0]
def __init__(
self,
bus: int | str,
baudrate: int,
/,
bits: int = 8,
parity: int | None = None,
stop: int = 1,
*,
timeout: int = 0,
flow: int = 0,
timeout_char: int = 0,
read_buf_len: int = 64,