code: function b64ToUint6 (nChr) {
  
    return nChr > 64 && nChr < 91 ?
        nChr - 65
      : nChr > 96 && nChr < 123 ?
        nChr - 71
      : nChr > 47 && nChr < 58 ?
        nChr + 4
      : nChr === 43 ?
        62
      : nChr === 47 ?
        63
      :
        0;
  
  }
docs: /*\
  |*|
  |*|  Base64 / binary data / UTF-8 strings utilities
  |*|
  |*|  https://developer.mozilla.org/en-US/docs/Web/JavaScript/Base64_encoding_and_decoding
  |*|
  \ /* Array of bytes to base64 string decoding