diff --git a/matemat/webserver/requestargs.py b/matemat/webserver/requestargs.py
index 02df0b2..f69a53d 100644
--- a/matemat/webserver/requestargs.py
+++ b/matemat/webserver/requestargs.py
@@ -43,7 +43,7 @@ class RequestArgument(object):
         # Assign name
         self.__name: str = name
         # Initialize value
-        self.__value: Union[Tuple[str, Union[bytes, str]], List[Tuple[str, Union[bytes, str]]]] = None
+        self.__value: Union[Tuple[str, Union[bytes, str]], List[Tuple[str, Union[bytes, str]]]] = []
         # Default to empty array
         if value is None:
             self.__value = []
@@ -98,6 +98,7 @@ class RequestArgument(object):
         :raises IndexError: If the index is out of bounds.
         :raises ValueError: If this is an array value, and no index is provided, or if this is a scalar value and an
                             index is provided.
+        :raises TypeError: If the requested value is neither a str nor a bytes object.
         """
         if self.is_array:
             # instance is an array value
@@ -123,6 +124,7 @@ class RequestArgument(object):
             elif isinstance(self.__value[1], bytes):
                 # The value is a bytes object, attempt to decode
                 return self.__value[1].decode('utf-8')
+        raise TypeError('Value is neither a str nor bytes')
 
     def get_bytes(self, index: int = None) -> bytes:
         """
@@ -134,6 +136,7 @@ class RequestArgument(object):
         :raises IndexError: If the index is out of bounds.
         :raises ValueError: If this is an array value, and no index is provided, or if this is a scalar value and an
                             index is provided.
+        :raises TypeError: If the requested value is neither a str nor a bytes object.
         """
         if self.is_array:
             # instance is an array value
@@ -159,6 +162,7 @@ class RequestArgument(object):
             elif isinstance(self.__value[1], str):
                 # The value is a string, encode first
                 return self.__value[1].encode('utf-8')
+        raise TypeError('Value is neither a str nor bytes')
 
     def get_content_type(self, index: int = None) -> Optional[str]:
         """
@@ -177,16 +181,18 @@ class RequestArgument(object):
                 # Needs an index for array values
                 raise ValueError('index must not be None')
             # Type hint; access array element
-            v: Tuple[str, Union[bytes, str]] = self.__value[index]
+            va: Tuple[str, Union[bytes, str]] = self.__value[index]
             # Return the content type of the requested value
-            return v[0]
+            return va[0]
         else:
             # instance is a scalar value
             if index is not None:
                 # Must not have an index for array values
                 raise ValueError('index must be None')
+            # Type hint
+            vs: Tuple[str, Union[bytes, str]] = self.__value
             # Return the content type of the scalar value
-            return self.__value[0]
+            return vs[0]
 
     def append(self, ctype: str, value: Union[str, bytes]):
         """
@@ -227,8 +233,8 @@ class RequestArgument(object):
             yield _View(self.__name, self.__value)
         else:
             # Typing helper
-            _value: List[Tuple[str, Union[bytes, str]]] = self.__value
-            for v in _value:
+            vs: List[Tuple[str, Union[bytes, str]]] = self.__value
+            for v in vs:
                 # If this is an array, yield an immutable scalar view for each (ctype, value) element in the array
                 yield _View(self.__name, v)