Buffer.equals() requires Buffer, not Uint8Array

[a-khushal]

The following comparison fails when toXOnly() returns a Buffer and outputKey is a Uint8Array:

Even if both values contain the same underlying bytes, .equals() does not accept Uint8Array arguments directly.

Using Buffer.from(outputKey) works as expected:

if ((0, bip371_1.toXOnly)(pubkey).equals(Buffer.from(outputKey))) {
  // works
}

Version
6.1.5

Expected behavior
outputKey must be a Buffer when used with .equals(). Currently, it’s an Uint8Array.

[a-khushal]

I did investigated the issue further to find that in getPrevoutTaprootKey of the psbt.js, the code uses .subarray(2, 34) on a Buffer. The problem is that Buffer.subarray() returns a Uint8Array view, not a Buffer.

This happens because Node.js defines:
Buffer.slice() --> returns a Buffer
Buffer.subarray() --> returns a Uint8Array

Fix: change to .slice(2, 34) to keep the return type consistent (Buffer).

[jasonandjay]

Maintainer triage: marking as bug (Buffer/Uint8Array interop).

We will treat this as near-term compatibility fix and track broader typed-array migration considerations in #1855.

[jasonandjay]

Maintainer follow-up: can you please re-test on the latest v7.x (currently 7.0.1)? The codebase has moved to Uint8Array-first APIs. If this still reproduces on latest, please post a minimal snippet; otherwise we will close as resolved by migration/compat updates.