//	-a-1 == ^a
		//
		// If the number is negative, we use an inversion mask to invert the
		// data bytes and treat the value as an unsigned number.
		var inv byte // 0x00 if positive or zero, 0xff if negative
		if b[0]&0x40 != 0 {
			inv = 0xff
		}

		var x uint64
		for i, c := range b {
			c ^= inv // Inverts c only if inv is 0xff, otherwise does nothing
			if i == 0 {

* ✏ Fix a small code highlight line error. PR [#5256](https://github.com/tiangolo/fastapi/pull/5256) by [@hjlarry](https://github.com/hjlarry).
* ♻ Internal small refactor, move `operation_id` parameter position in delete method for consistency with the code. PR [#4474](https://github.com/tiangolo/fastapi/pull/4474) by [@hiel](https://github.com/hiel).

// on it.
type Reader struct {
	buf          []byte
	rd           io.Reader // reader provided by the client
	r, w         int       // buf read and write positions
	err          error
	lastByte     int // last byte read for UnreadByte; -1 means invalid
	lastRuneSize int // size of last rune read for UnreadRune; -1 means invalid
}

const minReadBufferSize = 16