Revert "Remove node-specific logic from visit_default (#4321)"

This reverts commit 7134754.

src/black/linegen.py

@@ -152,6 +152,11 @@ def visit_default(self, node: LN) -> Iterator[Line]:
 
             if any_open_brackets:
                 node.prefix = ""
+            if self.mode.string_normalization and node.type == token.STRING:
+                node.value = normalize_string_prefix(node.value)
+                node.value = normalize_string_quotes(node.value)
+            if node.type == token.NUMBER:
+                normalize_numeric_literal(node)
             if node.type not in WHITESPACE:
                 self.current_line.append(node)
         yield from super().visit_default(node)
@@ -415,11 +420,12 @@ def visit_STRING(self, leaf: Leaf) -> Iterator[Line]:
             # indentation of those changes the AST representation of the code.
             if self.mode.string_normalization:
                 docstring = normalize_string_prefix(leaf.value)
-                # We handle string normalization at the end of this method, but since
-                # what we do right now acts differently depending on quote style (ex.
+                # visit_default() does handle string normalization for us, but
+                # since this method acts differently depending on quote style (ex.
                 # see padding logic below), there's a possibility for unstable
-                # formatting. To avoid a situation where this function formats a
-                # docstring differently on the second pass, normalize it early.
+                # formatting as visit_default() is called *after*. To avoid a
+                # situation where this function formats a docstring differently on
+                # the second pass, normalize it early.
                 docstring = normalize_string_quotes(docstring)
             else:
                 docstring = leaf.value
@@ -493,13 +499,6 @@ def visit_STRING(self, leaf: Leaf) -> Iterator[Line]:
             else:
                 leaf.value = prefix + quote + docstring + quote
 
-        if self.mode.string_normalization and leaf.type == token.STRING:
-            leaf.value = normalize_string_prefix(leaf.value)
-            leaf.value = normalize_string_quotes(leaf.value)
-        yield from self.visit_default(leaf)
-
-    def visit_NUMBER(self, leaf: Leaf) -> Iterator[Line]:
-        normalize_numeric_literal(leaf)
         yield from self.visit_default(leaf)
 
     def visit_fstring(self, node: Node) -> Iterator[Line]: