diff --git a/rich/console.py b/rich/console.py
index 23076865..7f47095b 100644
--- a/rich/console.py
+++ b/rich/console.py
@@ -586,7 +586,7 @@ class Console:
 
         _options = options or self.options
         render_iterable: RenderResult
-        if hasattr(renderable, "__rich__"):
+        if isinstance(renderable, RichCast):
             renderable = renderable.__rich__()
         if isinstance(renderable, ConsoleRenderable):
             render_iterable = renderable.__rich_console__(self, _options)
@@ -1085,7 +1085,7 @@ class Console:
         """Generate text from console contents (requires record=True argument in constructor).
 
         Args:
-            clear (bool, optional): Clear record buffer after exportint. Defaults to ``True``.
+            clear (bool, optional): Clear record buffer after exporting. Defaults to ``True``.
             styles (bool, optional): If ``True``, ansi escape codes will be included. ``False`` for plain text.
                 Defaults to ``False``.
 
@@ -1118,7 +1118,7 @@ class Console:
 
         Args:
             path (str): Path to write text files.
-            clear (bool, optional): Clear record buffer after exportint. Defaults to ``True``.
+            clear (bool, optional): Clear record buffer after exporting. Defaults to ``True``.
             styles (bool, optional): If ``True``, ansi style codes will be included. ``False`` for plain text.
                 Defaults to ``False``.
 
@@ -1139,7 +1139,7 @@ class Console:
 
         Args:
             theme (TerminalTheme, optional): TerminalTheme object containing console colors.
-            clear (bool, optional): Clear record buffer after exportint. Defaults to ``True``.
+            clear (bool, optional): Clear record buffer after exporting. Defaults to ``True``.
             code_format (str, optional): Format string to render HTML, should contain {foreground}
                 {background} and {code}.
             inline_styles (bool, optional): If ``True`` styles will be inlined in to spans, which makes files
@@ -1220,7 +1220,7 @@ class Console:
         Args:
             path (str): Path to write html file.
             theme (TerminalTheme, optional): TerminalTheme object containing console colors.
-            clear (bool, optional): Clear record buffer after exportint. Defaults to ``True``.
+            clear (bool, optional): Clear record buffer after exporting. Defaults to ``True``.
             code_format (str, optional): Format string to render HTML, should contain {foreground}
                 {background} and {code}.
             inline_styes (bool, optional): If ``True`` styles will be inlined in to spans, which makes files
diff --git a/rich/measure.py b/rich/measure.py
index 98282ee4..640e2e59 100644
--- a/rich/measure.py
+++ b/rich/measure.py
@@ -61,12 +61,13 @@ class Measurement(NamedTuple):
         Returns:
             Measurement: Measurement object containing range of character widths required to render the object.
         """
+        from rich.console import RichCast
 
         _max_width = console.width if max_width is None else max_width
         if isinstance(renderable, str):
             renderable = console.render_str(renderable)
 
-        if hasattr(renderable, "__rich__"):
+        if isinstance(renderable, RichCast):
             renderable = renderable.__rich__()
 
         if is_renderable(renderable):
diff --git a/rich/pretty.py b/rich/pretty.py
index 39838da2..62a45a51 100644
--- a/rich/pretty.py
+++ b/rich/pretty.py
@@ -86,7 +86,7 @@ class Pretty:
         *,
         indent_size: int = 4,
         justify: "JustifyMethod" = None,
-        overflow: "OverflowMethod" = "crop",
+        overflow: Optional["OverflowMethod"] = "crop",
         no_wrap: Optional[bool] = False,
     ) -> None:
         self._object = _object
@@ -222,11 +222,13 @@ class _Line:
         start_length = (
             len(self.whitespace) + cell_len(self.text) + cell_len(self.suffix)
         )
+        assert self.node is not None
         return self.node.check_length(start_length, max_length)
 
     def expand(self, indent_size: int) -> Iterable["_Line"]:
         """Expand this line by adding children on their own line."""
         node = self.node
+        assert node is not None
         whitespace = self.whitespace
         assert node.children
         if node.key_repr:
@@ -236,7 +238,7 @@ class _Line:
         else:
             yield _Line(text=node.open_brace, whitespace=whitespace)
         child_whitespace = self.whitespace + " " * indent_size
-        for child in self.node.children:
+        for child in node.children:
             line = _Line(
                 node=child,
                 whitespace=child_whitespace,
@@ -293,13 +295,13 @@ def pretty_repr(
 
             open_brace, close_brace, empty = _BRACES[type(obj)](obj)
             if obj:
+                children: List[_Node] = []
                 node = _Node(
                     open_brace=open_brace,
                     close_brace=close_brace,
-                    children=[],
+                    children=children,
                     last=root,
                 )
-                children = node.children
                 append = children.append
                 if isinstance(obj, dict):
                     for last, (key, child) in loop_last(obj.items()):