docs: function base64ArrayBuffer(bytes) {
      var base64    = ''
      var encodings = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
  
      var byteLength    = bytes.byteLength
      var byteRemainder = byteLength % 3
      var mainLength    = byteLength - byteRemainder
     
      var a, b, c, d
      var chunk
     
      // Main loop deals with bytes in chunks of 3
      for (var i = 0; i < mainLength; i = i + 3) {
        // Combine the three bytes into a single integer
        chunk = (bytes[i] << 16) | (bytes[i + 1] << 8) | bytes[i + 2]
     
        // Use bitmasks to extract 6-bit segments from the triplet
        a = (chunk & 16515072) >> 18 // 16515072 = (2^6 - 1) << 18
        b = (chunk & 258048)   >> 12 // 258048   = (2^6 - 1) << 12
        c = (chunk & 4032)     >>  6 // 4032     = (2^6 - 1) << 6
        d = chunk & 63               // 63       = 2^6 - 1
     
        // Convert the raw binary segments to the appropriate ASCII encoding
        base64 += encodings[a] + encodings[b] + encodings[c] + encodings[d]
      }
     
      // Deal with the remaining bytes and padding
      if (byteRemainder == 1) {
        chunk = bytes[mainLength]
     
        a = (chunk & 252) >> 2 // 252 = (2^6 - 1) << 2
     
        // Set the 4 least significant bits to zero
        b = (chunk & 3)   << 4 // 3   = 2^2 - 1
     
        base64 += encodings[a] + encodings[b] + '=='
      } else if (byteRemainder == 2) {
        chunk = (bytes[mainLength] << 8) | bytes[mainLength + 1]
     
        a = (chunk & 64512) >> 10 // 64512 = (2^6 - 1) << 10
        b = (chunk & 1008)  >>  4 // 1008  = (2^6 - 1) << 4
     
        // Set the 2 least significant bits to zero
        c = (chunk & 15)    <<  2 // 15    = 2^4 - 1
     
        base64 += encodings[a] + encodings[b] + encodings[c] + '='
      }
      
      return base64
    }