fix typing and add comment in encryption

Author: sleepyStick

pymongo/asynchronous/encryption.py

@@ -398,6 +398,7 @@ def __init__(self, client: AsyncMongoClient[_DocumentTypeArg], opts: AutoEncrypt
             encrypted_fields_map = _dict_to_bson(opts._encrypted_fields_map, False, _DATA_KEY_OPTS)
         self._bypass_auto_encryption = opts._bypass_auto_encryption
         self._internal_client = None
+        # parsing kms_ssl_contexts here so that parsing errors will be raised before internal clients are created
         opts._kms_ssl_contexts(_IS_SYNC)
 
         def _get_internal_client(

pymongo/encryption_options.py

@@ -239,8 +239,8 @@ def __init__(
             self._mongocryptd_spawn_args.append("--idleShutdownTimeoutSecs=60")
         # Maps KMS provider name to a SSLContext.
         self._kms_tls_options = kms_tls_options
-        self._sync_kms_ssl_contexts: dict[str, SSLContext] = None  # type:ignore[assignment]
-        self._async_kms_ssl_contexts: dict[str, SSLContext] = None  # type:ignore[assignment]
+        self._sync_kms_ssl_contexts: Optional[dict[str, SSLContext]] = None
+        self._async_kms_ssl_contexts: Optional[dict[str, SSLContext]] = None
         self._bypass_query_analysis = bypass_query_analysis
         self._key_expiration_ms = key_expiration_ms
 

pymongo/synchronous/encryption.py

@@ -395,6 +395,7 @@ def __init__(self, client: MongoClient[_DocumentTypeArg], opts: AutoEncryptionOp
             encrypted_fields_map = _dict_to_bson(opts._encrypted_fields_map, False, _DATA_KEY_OPTS)
         self._bypass_auto_encryption = opts._bypass_auto_encryption
         self._internal_client = None
+        # parsing kms_ssl_contexts here so that parsing errors will be raised before internal clients are created
         opts._kms_ssl_contexts(_IS_SYNC)
 
         def _get_internal_client(