message: actually clear bit 63 instead of bit 55
diff: @@ -147,7 +147,7 @@ export async function encryptMegolmKeyFile(data, password, options) {
  // clear bit 63 of the IV to stop us hitting the 64-bit counter boundary
  // (which would mean we wouldn't be able to decrypt on Android). The loss
  // of a single bit of iv is a price we have to pay.
  - iv[9] &= 0x7f;
  + iv[8] &= 0x7f;
  const [aesKey, hmacKey] = await deriveKeys(salt, kdfRounds, password);
  const encodedData = new TextEncoder().encode(data);
  