Implement .encode() to allow Starlette Response to consume a htpy ele…

…ment directly.

htpy/__init__.py

@@ -273,6 +273,12 @@ def _iter_context(self, ctx: dict[Context[t.Any], t.Any]) -> Iterator[str]:
     def __repr__(self) -> str:
         return f"<{self.__class__.__name__} '{self}'>"
 
+    # Allow starlette Response.render to directly render this element without
+    # explicitly casting to str:
+    # https://github.com/encode/starlette/blob/5ed55c441126687106109a3f5e051176f88cd3e6/starlette/responses.py#L44-L49
+    def encode(self, encoding: str = "utf-8", errors: str = "strict") -> bytes:
+        return str(self).encode(encoding, errors)
+
     # Avoid having Django "call" a htpy element that is injected into a
     # template. Setting do_not_call_in_templates will prevent Django from doing
     # an extra call: