Describe the Bug

When using a __builtins__.pyi file, functions named simply _ aren't properly recognized, unlike other functions:

# test.py
gettext("a")
_("b")

# __builtins__.pyi
def gettext(message: str) -> str: ...
def _(message: str) -> str: ...

$ pyrefly check
 INFO Checking current directory with default configuration
ERROR Could not find name `_` [unknown-name]
 --> test.py:2:1
  |
2 | _("b")
  | ^
  |
 INFO 1 error

Pyright handles this correctly:

$ pyright
0 errors, 0 warnings, 0 informations

Aliasing gettext to _ is a common thing to do, so it would be useful if this were supported.

Sandbox Link

https://pyrefly.org/sandbox/?project=N4IgZglgNgpgziAXKOBDAdgEwEYHsAeAdAA4CeSIAxAAQDqMUAxrgLYzUAuunAFuwAqkATjDBRS1AMoYcBADS8IcakuqpqxVAHMYAHXQ0A7nxHVSuAK7VGGaoaEQOMBXB6pTM6rHfo1eCxycpMQQ6FoqvoIcPLjohPqUCdQAEjAeHtaWxLDUYDCoHBYiyrhgispoWHj4iEkAtNQA4jCBIqhQdRwQbEHE7Ix8jADWoeF5MDiow-XUAKpw7CIAbvlQAPocwTAAFACUnNyhcH2MgaF5QiKYvfAzMPh9DmzogYaOPLzsAJIAIgCiuXyhWKvAKdnYcAsxGIuCEgW2MEIWkIagCuGYLGyLWc1C0uE6%2BMwolCjggsQUMRWQgULUYuxmtAcTjUWGoQgskVI0VimSJ1EwEBEp3EETMliE1GwQlwhgWQn0%2Bh0HCc%2BA4210IFQGvp6DW6pA2G1IDkIDIIjEpEIXBYUAoNEE5pFlVk%2BEy6EgWiKBTJcSSkhg7B4yuIcEQAHow2bROJCLCtGGYOgw5h0XAw8x3RBPUJvbEw7lYWolqhoKhsDkMx6vV0ebhiDX0HB4ugyNz0HUqXAfdQALzUDUAZkIAEYAEwa-TGkBrNbYCzQLqNmckUgQChEspKlVqthwNA6RDUOAcIT7OoAPiPJ8PhFv%2Bg31D1u-3MEPx9P1AvV6EN9vIAAviaUxdCsABi0AwBQzrVCuAFAA

(Only applicable for extension issues) IDE Information

No response