writeClen

    pub fn writeClen(
        b: *BitWriter,
        hclen: u4,
        clen_values: []u8,
        clen_extra: []u8,
        clen_codes: [19]u16,
        clen_bits: [19]u4,
    ) Writer.Error!void {
        // Write the first four clen entries seperately since they are always present,
        // and writing them all at once takes too many bits.
        try b.write(clen_bits[token.codegen_order[0]] |
            @shlExact(@as(u6, clen_bits[token.codegen_order[1]]), 3) |
            @shlExact(@as(u9, clen_bits[token.codegen_order[2]]), 6) |
            @shlExact(@as(u12, clen_bits[token.codegen_order[3]]), 9), 12);

        var i = hclen;
        var clen_bits_table: u45 = 0;
        while (i != 0) {
            i -= 1;
            clen_bits_table <<= 3;
            clen_bits_table |= clen_bits[token.codegen_order[4..][i]];
        }
        try b.write(clen_bits_table, @as(u6, hclen) * 3);

        for (clen_values, clen_extra) |value, extra| {
            try b.write(
                clen_codes[value] | @shlExact(@as(u16, extra), clen_bits[value]),
                clen_bits[value] + @as(u3, switch (value) {
                    0...15 => 0,
                    16 => 2,
                    17 => 3,
                    18 => 7,
                    else => unreachable,
                }),
            );
        }
    }