diff --git a/changes/2021.feature.md b/changes/2021.feature.md
new file mode 100644
index 000000000..df4ef7b30
--- /dev/null
+++ b/changes/2021.feature.md
@@ -0,0 +1 @@
+Add `None` check for every put function in `JSONObjectBuilder`
diff --git a/hikari/internal/data_binding.py b/hikari/internal/data_binding.py
index 923514dcb..f41d304ad 100644
--- a/hikari/internal/data_binding.py
+++ b/hikari/internal/data_binding.py
@@ -296,7 +296,8 @@ def put(
         value
             The JSON type to put. This may be a non-JSON type if a conversion
             is also specified. This may alternatively be undefined. In the latter
-            case, nothing is performed.
+            case, nothing is performed. This may also be [`None`][], in which case
+            the value isn't cast and is stored as-is.
         conversion
             The optional conversion to apply.
         """
@@ -309,13 +310,13 @@ def put(
             self[key] = conversion(value)
 
     @typing.overload
-    def put_array(self, key: str, values: undefined.UndefinedOr[typing.Iterable[JSONish]], /) -> None: ...
+    def put_array(self, key: str, values: undefined.UndefinedNoneOr[typing.Iterable[JSONish]], /) -> None: ...
 
     @typing.overload
     def put_array(
         self,
         key: str,
-        values: undefined.UndefinedOr[typing.Iterable[T_co]],
+        values: undefined.UndefinedNoneOr[typing.Iterable[T_co]],
         /,
         *,
         conversion: typing.Callable[[T_co], JSONish],
@@ -324,7 +325,7 @@ def put_array(
     def put_array(
         self,
         key: str,
-        values: undefined.UndefinedOr[typing.Iterable[typing.Any]],
+        values: undefined.UndefinedNoneOr[typing.Iterable[typing.Any]],
         /,
         *,
         conversion: typing.Optional[typing.Callable[[typing.Any], JSONish]] = None,
@@ -342,15 +343,21 @@ def put_array(
         values
             The JSON types to put. This may be an iterable of non-JSON types if
             a conversion is also specified. This may alternatively be undefined.
-            In the latter case, nothing is performed.
+            In the latter case, nothing is performed. This may also be [`None`][],
+            in which case the value isn't cast and is stored as-is.
         conversion
             The optional conversion to apply.
         """
-        if values is not undefined.UNDEFINED:
+        if values is undefined.UNDEFINED:
+            return
+
+        if values is not None:
             if conversion is not None:
                 self[key] = [conversion(value) for value in values]
             else:
                 self[key] = list(values)
+        else:
+            self[key] = None
 
     def put_snowflake(
         self, key: str, value: undefined.UndefinedNoneOr[snowflakes.SnowflakeishOr[snowflakes.Unique]], /
@@ -366,15 +373,21 @@ def put_snowflake(
         value
             The JSON type to put. This may alternatively be undefined, in this
             case, nothing is performed. This may also be [`None`][], in this
-            case the value isn't cast.
+            case the value isn't cast and is stored as-is.
         """
-        if value is not undefined.UNDEFINED and value is not None:
+        if value is undefined.UNDEFINED:
+            return
+
+        if value is not None:
             self[key] = str(int(value))
-        elif value is None:
+        else:
             self[key] = None
 
     def put_snowflake_array(
-        self, key: str, values: undefined.UndefinedOr[typing.Iterable[snowflakes.SnowflakeishOr[snowflakes.Unique]]], /
+        self,
+        key: str,
+        values: undefined.UndefinedNoneOr[typing.Iterable[snowflakes.SnowflakeishOr[snowflakes.Unique]]],
+        /,
     ) -> None:
         """Put an array of snowflakes with the given key into this builder.
 
@@ -388,10 +401,16 @@ def put_snowflake_array(
             The key to give the element.
         values
             The JSON snowflakes to put. This may alternatively be undefined.
-            In the latter case, nothing is performed.
+            In the latter case, nothing is performed. This may also be [`None`][],
+            in which case the value isn't cast and is stored as-is.
         """
-        if values is not undefined.UNDEFINED:
+        if values is undefined.UNDEFINED:
+            return
+
+        if values is not None:
             self[key] = [str(int(value)) for value in values]
+        else:
+            self[key] = None
 
 
 def cast_variants_array(cast: typing.Callable[[T_co], T], raw_values: typing.Iterable[T_co], /) -> list[T]: