ecc.ECPubkey: also accept bytearray in __init__

regression since #5947

Traceback (most recent call last):
  File "...\electrum\electrum\base_wizard.py", line 339, in on_device
    self.plugin.setup_device(device_info, self, purpose)
  File "...\electrum\electrum\plugins\ledger\ledger.py", line 598, in setup_device
    client.get_xpub("m/44'/0'", 'standard') # TODO replace by direct derivation once Nano S > 1.1
  File "...\electrum\electrum\plugins\ledger\ledger.py", line 55, in catch_exception
    return func(self, *args, **kwargs)
  File "...\electrum\electrum\plugins\ledger\ledger.py", line 124, in get_xpub
    eckey=ecc.ECPubkey(publicKey),
  File "...\electrum\electrum\ecc.py", line 145, in __init__
    self._x, self._y = _x_and_y_from_pubkey_bytes(b)
  File "...\electrum\electrum\ecc.py", line 119, in _x_and_y_from_pubkey_bytes
    ret = _libsecp256k1.secp256k1_ec_pubkey_parse(
ctypes.ArgumentError: argument 3: <class 'TypeError'>: wrong type

electrum/ecc.py

@@ -115,6 +115,7 @@ def sig_string_from_r_and_s(r: int, s: int) -> bytes:
 
 
 def _x_and_y_from_pubkey_bytes(pubkey: bytes) -> Tuple[int, int]:
+    assert isinstance(pubkey, bytes), f'pubkey must be bytes, not {type(pubkey)}'
     pubkey_ptr = create_string_buffer(64)
     ret = _libsecp256k1.secp256k1_ec_pubkey_parse(
         _libsecp256k1.ctx, pubkey_ptr, pubkey, len(pubkey))
@@ -141,7 +142,9 @@ class ECPubkey(object):
 
     def __init__(self, b: Optional[bytes]):
         if b is not None:
-            assert_bytes(b)
+            assert isinstance(b, (bytes, bytearray)), f'pubkey must be bytes-like, not {type(b)}'
+            if isinstance(b, bytearray):
+                b = bytes(b)
             self._x, self._y = _x_and_y_from_pubkey_bytes(b)
         else:
             self._x, self._y = None, None

electrum/plugins/ledger/ledger.py

@@ -121,7 +121,7 @@ class Ledger_Client(HardwareClientBase):
         publicKey = compress_public_key(nodeData['publicKey'])
         depth = len(bip32_intpath)
         return BIP32Node(xtype=xtype,
-                         eckey=ecc.ECPubkey(publicKey),
+                         eckey=ecc.ECPubkey(bytes(publicKey)),
                          chaincode=nodeData['chainCode'],
                          depth=depth,
                          fingerprint=fingerprint_bytes,