Invalid Unicode escapes in bytes literals

[InSyncWithFoo]

Pyright seems to be accepting these Unicode escapes; it resolves all of them to b'\xFF' regardless of the actual values (playground):

a = b'\u00FF'      # Literal[b"\xff"]
b = b'\uFFFF'      # Literal[b"\xff"]
c = b'\U0000FFFF'  # Literal[b"\xff"]
d = b'\U00F0FFFF'  # Literal[b"\xff"]

However, \u and \U escapes are not recognized within bytes literals:

Python 3.14.0a1 (tags/v3.14.0a1:8cdaca8, Oct 15 2024, 20:08:21) [MSC v.1941 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> b'\u00FF'
<python-input-0>:1: SyntaxWarning: invalid escape sequence '\u'
  b'\u00FF'
b'\\u00FF'

[erictraut]

Yeah, pyright's logic doesn't currently check for this syntax error. I think it's a reasonable enhancement request.