how does axios handle blob vs arraybuffer as responseType?

(async () => {  const url = 'https://upload.wikimedia.org/wikipedia/commons/4/47/PNG_transparency_demonstration_1.png';  // fetch as binary  const buffer = await fetch( url ).then(resp => resp.arrayBuffer());  const header = new Uint8Array( buffer ).slice( 0, 4 );  console.log( 'binary header', header ); // [ 137, 80, 78, 61 ]  console.log( 'entity encoded', entityEncode( header ) );  // [ "U+0089", "U+0050", "U+004E", "U+0047" ]  // You can read more about  (U+0089) character here  // https://www.fileformat.info/info/unicode/char/0089/index.htm  // You can see in the left table how this character in UTF-8 needs two bytes (0xC2 0x89)  // We thus can't map this character correctly in UTF-8 from the UTF-16 codePoint,  // it will get discarded by the parser and converted to the replacement character    // read as UTF-8   const utf8_str = await new Blob( [ header ] ).text();  console.log( 'read as UTF-8', utf8_str ); // "�PNG"  // build back a binary array from that string  const utf8_binary = [ ...utf8_str ].map( char => char.charCodeAt( 0 ) );  console.log( 'Which is binary', utf8_binary ); // [ 65533, 80, 78, 61 ]  console.log( 'entity encoded', entityEncode( utf8_binary ) );  // [ "U+FFDD", "U+0050", "U+004E", "U+0047" ]  // You can read more about character � (U+FFDD) here  // https://www.fileformat.info/info/unicode/char/0fffd/index.htm  //  // P (U+0050), N (U+004E) and G (U+0047) characters are compatible between UTF-8 and UTF-16  // For these there is no encoding lost  // (that's how base64 encoding makes it possible to send binary data as text)    // now let's see what fetching as text holds  const fetched_as_text = await fetch( url ).then( resp => resp.text() );  const header_as_text = fetched_as_text.slice( 0, 4 );  console.log( 'fetched as "text"', header_as_text ); // "�PNG"  const as_text_binary = [ ...header_as_text ].map( char => char.charCodeAt( 0 ) );  console.log( 'Which is binary', as_text_binary ); // [ 65533, 80, 78, 61 ]  console.log( 'entity encoded', entityEncode( as_text_binary ) );  // [ "U+FFDD", "U+0050", "U+004E", "U+0047" ]  // It's been read as UTF-8, we lost the first byte.  })();function entityEncode( arr ) {  return Array.from( arr ).map( val => 'U+' + toHex( val ) );}function toHex( num ) {  return num.toString( 16 ).padStart(4, '0').toUpperCase();}