diff --git a/lamb_engine/nodes/nodes.py b/lamb_engine/nodes/nodes.py
index 277bf06..fb979b2 100644
--- a/lamb_engine/nodes/nodes.py
+++ b/lamb_engine/nodes/nodes.py
@@ -77,8 +77,8 @@ class Node:
 		self.parent_side: Direction = None # type: ignore
 
 		# Left and right nodes, None if empty
-		self._left: Node | None = None
-		self._right: Node | None = None
+		self._left = None
+		self._right = None
 
 		# The runner this node is attached to.
 		# Set by Node.set_runner()
@@ -341,7 +341,7 @@ class Bound(EndNode):
 		# The name of the macro this bound came from.
 		# Always equal to self.name, unless the macro
 		# this came from had a subscript.
-		self.macro_name: str | None = macro_name
+		self.macro_name = macro_name
 
 		if forced_id is None:
 			self.identifier = bound_counter
@@ -381,9 +381,9 @@ class Func(Node):
 				Func.from_parse(result)
 			)
 
-	def __init__(self, input: Macro | Bound, output: Node, *, runner = None) -> None:
+	def __init__(self, input, output: Node, *, runner = None) -> None:
 		super().__init__()
-		self.input: Macro | Bound = input
+		self.input = input
 		self.left: Node = output
 		self.right: None = None
 		self.runner = runner # type: ignore
diff --git a/lamb_engine/runner/commands.py b/lamb_engine/runner/commands.py
index 7f4966e..47dee34 100644
--- a/lamb_engine/runner/commands.py
+++ b/lamb_engine/runner/commands.py
@@ -14,7 +14,7 @@ help_texts = {}
 
 def lamb_command(
 		*,
-		command_name: str | None = None,
+		command_name = None,
 		help_text: str
 	):
 	"""
diff --git a/lamb_engine/runner/runner.py b/lamb_engine/runner/runner.py
index a3944b1..69a906b 100644
--- a/lamb_engine/runner/runner.py
+++ b/lamb_engine/runner/runner.py
@@ -46,7 +46,7 @@ class Runner:
 		# Maximum amount of reductions.
 		# If None, no maximum is enforced.
 		# Must be at least 1.
-		self.reduction_limit: int | None = 1_000_000
+		self.reduction_limit = 1_000_000
 
 		# Ensure bound variables are unique.
 		# This is automatically incremented whenever we make
@@ -74,7 +74,7 @@ class Runner:
 			message = self.prompt_message
 		)
 
-	def parse(self, line) -> tuple[lamb_engine.nodes.Root | MacroDef | Command, list]:
+	def parse(self, line): # -> tuple[lamb_engine.nodes.Root | MacroDef | Command, list]
 		e = self.parser.parse_line(line)
 
 		w = []