Fix various review comments.

- Missing import in _ffi/__init__.py
- Updated docstring of t2b
- Reverted change to Random.__del__()

Author: roberthdevries

wolfcrypt/_ffi/__init__.pyi

@@ -1,4 +1,5 @@
 import _cffi_backend
+import _ffi.lib as lib
 
 ffi: _cffi_backend.FFI
 

wolfcrypt/_ffi/lib.pyi

@@ -1,6 +1,6 @@
 
 from _cffi_backend import FFI
-from typing_extensions import TypeAlias
+from typing import TypeAlias
 
 INVALID_DEVID: int
 

wolfcrypt/random.py

@@ -47,7 +47,7 @@ def __init__(self, nonce=b"", device_id=_lib.INVALID_DEVID) -> None:
     def __del__(self) -> None:
         if self.native_object:
             try:
-                Random._delete(self.native_object)
+                self._delete(self.native_object)
             except AttributeError:
                 # Can occur during interpreter shutdown
                 pass

wolfcrypt/utils.py

@@ -29,7 +29,8 @@ def t2b(string: bytes | bytearray | memoryview | str) -> bytes:
     """
     Converts text to binary.
 
-    Passes through bytes, bytearray, and memoryview unchanged.
+    Passes through bytes unchanged.
+    Objects of type bytearray or memoryview are converted to bytes.
     Encodes str to UTF-8 bytes.
     """
     if isinstance(string, (bytes, bytearray, memoryview)):