message: Use existing bigendian parser
diff: import { toAscii } from "@cosmjs/encoding";
  +import { Uint64 } from "@cosmjs/math";
  import Long from "long";
  import { ibc } from "../codec";
  @@ -58,14 +59,6 @@ export interface IbcExtension {
  };
  }
  -// TODO: pull this into encoding helpers
  -function parseUint64BigEndian(bytes: Uint8Array): number {
  - const d = new DataView(bytes.buffer);
  - // Note: this will have rounding issues after 2**53, but we never hit these numbers
  - // when we do, support for bigints (eg. 1234n) will be stabilized
  - return 2 ** 32 * d.getUint32(0) + d.getUint32(4);
  -}
  -
  export function setupIbcExtension(base: QueryClient): IbcExtension {
  // Use this service to get easy typed access to query methods
  // This cannot be used to for proof verification
  @@ -118,7 +111,7 @@ export function setupIbcExtension(base: QueryClient): IbcExtension {
  // key: https://github.com/cosmos/cosmos-sdk/blob/ef0a7344af345882729598bc2958a21143930a6b/x/ibc/24-host/keys.go#L133-L136
  const key = toAscii(`seqAcks/ports/${portId}/channels/${channelId}/nextSequenceAck`);
  const responseData = await base.queryVerified("ibc", key);
  - return responseData.length ? parseUint64BigEndian(responseData) : null;
  + return responseData.length ? Uint64.fromBytesBigEndian(responseData).toNumber() : null;
  },
  unverified: {
  