message: refactor to use upper and lower case terms
diff: @@ -129,11 +129,11 @@ export function encodeVLQ(value: number): string {
  * failure.
  */
  export function decode(charCode: number): number {
  - const bigA = 65; // 'A'
  - const bigZ = 90; // 'Z'
  + const uppercaseA = 65; // 'A'
  + const uppercaseZ = 90; // 'Z'
  - const littleA = 97; // 'a'
  - const littleZ = 122; // 'z'
  + const lowercaseA = 97; // 'a'
  + const lowercaseZ = 122; // 'z'
  const zero = 48; // '0'
  const nine = 57; // '9'
  @@ -141,17 +141,17 @@ export function decode(charCode: number): number {
  const plus = 43; // '+'
  const slash = 47; // '/'
  - const littleOffset = 26;
  + const lowercaseOffset = 26;
  const numberOffset = 52;
  // 0 - 25: ABCDEFGHIJKLMNOPQRSTUVWXYZ
  - if (bigA <= charCode && charCode <= bigZ) {
  - return charCode - bigA;
  + if (uppercaseA <= charCode && charCode <= uppercaseZ) {
  + return charCode - uppercaseA;
  }
  // 26 - 51: abcdefghijklmnopqrstuvwxyz
  - if (littleA <= charCode && charCode <= littleZ) {
  - return charCode - littleA + littleOffset;
  + if (lowercaseA <= charCode && charCode <= lowercaseZ) {
  + return charCode - lowercaseA + lowercaseOffset;
  }
  // 52 - 61: 0123456789
  