EncodeEscapedChar is used internally to write out a character from a larger string that needs to be escaped to a buffer.

NeedEscape returns whether the given byte needs to be escaped.

DontEscape is a sentinel value for characters that don't need to be escaped.

EncodeMap specifies how to escape binary data with '\'.

HexMap is a mapping from each byte to the `\x%%` hex form as a []byte.

RawHexMap is a mapping from each byte to the `%%` hex form as a []byte.