pub struct ByteBuilder {
    bytes: Vec<u8>,
    pending: u8,
    bit: u8,
}

impl ByteBuilder {
    pub fn new() -> Self {
        Self {
            bytes: vec![],
            pending: 0,
            bit: 0,
        }
    }

    pub fn push(&mut self, bit: impl Into<bool>) {
        self.pending <<= 1;
        self.bit += 1;
        self.pending |= u8::from(bit.into());
        if self.bit == 8 {
            self.bytes.push(std::mem::replace(&mut self.pending, 0));
            self.bit = 0;
        }
    }
}

impl From<ByteBuilder> for Vec<u8> {
    fn from(b: ByteBuilder) -> Self {
        b.bytes
    }
}