diff --git a/examples/filetree.lua b/examples/filetree.lua
index d3b3998..ed175b0 100644
--- a/examples/filetree.lua
+++ b/examples/filetree.lua
@@ -10,10 +10,10 @@
 --   change on the underlying filesystem.
 --------------------------------------------------------------------------------
 
---- @alias FsDir { kind: 'dir'; path: string; expanded: boolean; children: FsNode[] }
---- @alias FsFile { kind: 'file'; path: string }
---- @alias FsNode FsDir | FsFile
---- @alias ShowOpts { root_path?: string, width?: number, focus_path?: string }
+--- @alias u.examples.FsDir { kind: 'dir'; path: string; expanded: boolean; children: u.examples.FsNode[] }
+--- @alias u.examples.FsFile { kind: 'file'; path: string }
+--- @alias u.examples.FsNode u.examples.FsDir | u.examples.FsFile
+--- @alias u.examples.ShowOpts { root_path?: string, width?: number, focus_path?: string }
 
 local Buffer = require 'u.buffer'
 local Renderer = require('u.renderer').Renderer
@@ -58,13 +58,13 @@ function H.relative(path, base)
 end
 
 --- @param root_path string
---- @return { tree: FsDir; path_to_node: table<string, FsNode> }
+--- @return { tree: u.examples.FsDir; path_to_node: table<string, u.examples.FsNode> }
 function H.get_tree_inf(root_path)
   logger:info { 'get_tree_inf', root_path }
-  --- @type table<string, FsNode>
+  --- @type table<string, u.examples.FsNode>
   local path_to_node = {}
 
-  --- @type FsDir
+  --- @type u.examples.FsDir
   local tree = {
     kind = 'dir',
     path = H.normalize(root_path or '.'),
@@ -77,8 +77,8 @@ function H.get_tree_inf(root_path)
   return { tree = tree, path_to_node = path_to_node }
 end
 
---- @param tree FsDir
---- @param path_to_node table<string, FsNode>
+--- @param tree u.examples.FsDir
+--- @param path_to_node table<string, u.examples.FsNode>
 function H.populate_dir_children(tree, path_to_node)
   tree.children = {}
 
@@ -135,7 +135,7 @@ local function _render_in_buffer(opts)
       local parts = H.split_path(H.relative(focused_path, tree_inf.tree.path))
       local path_to_node = tree_inf.path_to_node
 
-      --- @param node FsDir
+      --- @param node u.examples.FsDir
       --- @param child_names string[]
       local function expand_to(node, child_names)
         if #child_names == 0 then return end
@@ -310,7 +310,7 @@ local function _render_in_buffer(opts)
   --
   local renderer = Renderer.new(opts.bufnr)
   tracker.create_effect(function()
-    --- @type { tree: FsDir; path_to_node: table<string, FsNode> }
+    --- @type { tree: u.examples.FsDir; path_to_node: table<string, u.examples.FsNode> }
     local tree_inf = s_tree_inf:get()
     local tree = tree_inf.tree
 
@@ -329,7 +329,7 @@ local function _render_in_buffer(opts)
 
     --- Since the filesystem is a recursive tree of nodes, we need to
     --- recursively render each node. This function does just that:
-    --- @param node FsNode
+    --- @param node u.examples.FsNode
     --- @param level number
     local function render_node(node, level)
       local name = vim.fs.basename(node.path)
@@ -414,7 +414,7 @@ end
 local current_inf = nil
 
 --- Show the filetree:
---- @param opts? ShowOpts
+--- @param opts? u.examples.ShowOpts
 function M.show(opts)
   if current_inf ~= nil then return current_inf.controller end
   opts = opts or {}
@@ -456,7 +456,7 @@ function M.hide()
 end
 
 --- Toggle the filetree:
---- @param opts? ShowOpts
+--- @param opts? u.examples.ShowOpts
 function M.toggle(opts)
   if current_inf == nil then
     M.show(opts)
diff --git a/examples/notify.lua b/examples/notify.lua
index 869404f..7d289d5 100644
--- a/examples/notify.lua
+++ b/examples/notify.lua
@@ -14,7 +14,7 @@ local ICONS = {
 }
 local DEFAULT_ICON = { text = '', group = 'DiagnosticSignOk' }
 
---- @alias Notification {
+--- @alias u.examples.Notification {
 ---   kind: number;
 ---   id: number;
 ---   text: string;
@@ -30,7 +30,7 @@ local s_notifications = s_notifications_raw:debounce(50)
 
 -- Render effect:
 tracker.create_effect(function()
-  --- @type Notification[]
+  --- @type u.examples.Notification[]
   local notifs = s_notifications:get()
 
   if #notifs == 0 then
@@ -99,14 +99,14 @@ local function my_notify(msg, level, opts)
 
   local id = math.random(math.huge)
 
-  --- @param notifs Notification[]
+  --- @param notifs u.examples.Notification[]
   s_notifications_raw:schedule_update(function(notifs)
     table.insert(notifs, { kind = level, id = id, text = msg })
     return notifs
   end)
 
   vim.defer_fn(function()
-    --- @param notifs Notification[]
+    --- @param notifs u.examples.Notification[]
     s_notifications_raw:schedule_update(function(notifs)
       for i, notif in ipairs(notifs) do
         if notif.id == id then
diff --git a/examples/picker.lua b/examples/picker.lua
index a388733..866d8fc 100644
--- a/examples/picker.lua
+++ b/examples/picker.lua
@@ -44,7 +44,7 @@ local function shallow_copy_arr(arr) return vim.iter(arr):totable() end
 --    shortest portion of this function.
 --------------------------------------------------------------------------------
 
---- @alias SelectController {
+--- @alias u.examples.SelectController {
 ---   get_items: fun(): T[];
 ---   set_items: fun(items: T[]);
 ---   set_filter_text: fun(filter_text: string);
@@ -53,17 +53,17 @@ local function shallow_copy_arr(arr) return vim.iter(arr):totable() end
 ---   set_selected_indices: fun(indicies: number[], ephemeral?: boolean);
 ---   close: fun();
 --- }
---- @alias SelectOpts<T> {
+--- @alias u.examples.SelectOpts<T> {
 ---   items: `T`[];
 ---   multi?: boolean;
----   format_item?: fun(item: T): Tree;
+---   format_item?: fun(item: T): u.renderer.Tree;
 ---   on_finish?: fun(items: T[], indicies: number[]);
 ---   on_selection_changed?: fun(items: T[], indicies: number[]);
----   mappings?: table<string, fun(select: SelectController)>;
+---   mappings?: table<string, fun(select: u.examples.SelectController)>;
 --- }
 
 --- @generic T
---- @param opts SelectOpts<T>
+--- @param opts u.examples.SelectOpts<T>
 function M.create_picker(opts) -- {{{
   local is_in_insert_mode = vim.api.nvim_get_mode().mode:sub(1, 1) == 'i'
   local stopinsert = not is_in_insert_mode
@@ -557,7 +557,7 @@ function M.create_picker(opts) -- {{{
     return safe_run(function() H.finish(true) end)
   end
 
-  return controller --[[@as SelectController]]
+  return controller --[[@as u.examples.SelectController]]
 end -- }}}
 
 --------------------------------------------------------------------------------
diff --git a/lua/u/renderer.lua b/lua/u/renderer.lua
index d99c3a7..7af561f 100644
--- a/lua/u/renderer.lua
+++ b/lua/u/renderer.lua
@@ -373,6 +373,10 @@ function Renderer:_expr_map_callback(mode, lhs) -- {{{
 end -- }}}
 
 function Renderer:_on_text_changed()
+  -- Reset changedtick, so that the reconciler knows to refresh its cached
+  -- buffer-content before computing the diff:
+  self.changedtick = 0
+
   --- @type integer, integer
   local l, c = unpack(vim.api.nvim_win_get_cursor(0))
   l = l - 1 -- make it actually 0-based
@@ -574,13 +578,13 @@ function TreeBuilder:tree() return self.nodes end
 
 -- Levenshtein utility {{{
 -- luacheck: ignore
---- @alias LevenshteinChange<T> ({ kind: 'add'; item: T; index: number; } | { kind: 'delete'; item: T; index: number; } | { kind: 'change'; from: T; to: T; index: number; })
+--- @alias u.renderer.LevenshteinChange<T> ({ kind: 'add'; item: T; index: number; } | { kind: 'delete'; item: T; index: number; } | { kind: 'change'; from: T; to: T; index: number; })
 --- @private
 --- @generic T
 --- @param x `T`[]
 --- @param y T[]
 --- @param cost? { of_delete?: fun(x: T): number; of_add?: fun(x: T): number; of_change?: fun(x: T, y: T): number; }
---- @return LevenshteinChange<T>[] The changes, from last (greatest index) to first (smallest index).
+--- @return u.renderer.LevenshteinChange<T>[] The changes, from last (greatest index) to first (smallest index).
 function H.levenshtein(x, y, cost)
   -- At the moment, this whole `cost` plumbing is not used. Deletes have the
   -- same cost as Adds or Changes. I can imagine a future, however, where
@@ -631,7 +635,7 @@ function H.levenshtein(x, y, cost)
   -- Backtrack to find the changes
   local i = m
   local j = n
-  --- @type LevenshteinChange[]
+  --- @type u.renderer.LevenshteinChange[]
   local changes = {}
 
   while i > 0 or j > 0 do
@@ -648,7 +652,7 @@ function H.levenshtein(x, y, cost)
     if is_first_min(cost_of_change, cost_of_add, cost_of_delete) then
       -- potential change
       if x[i] ~= y[j] then
-        --- @type LevenshteinChange
+        --- @type u.renderer.LevenshteinChange
         local change = { kind = 'change', from = x[i], index = i, to = y[j] }
         table.insert(changes, change)
       end
@@ -656,13 +660,13 @@ function H.levenshtein(x, y, cost)
       j = j - 1
     elseif is_first_min(cost_of_add, cost_of_change, cost_of_delete) then
       -- addition
-      --- @type LevenshteinChange
+      --- @type u.renderer.LevenshteinChange
       local change = { kind = 'add', item = y[j], index = i + 1 }
       table.insert(changes, change)
       j = j - 1
     elseif is_first_min(cost_of_delete, cost_of_change, cost_of_add) then
       -- deletion
-      --- @type LevenshteinChange
+      --- @type u.renderer.LevenshteinChange
       local change = { kind = 'delete', item = x[i], index = i }
       table.insert(changes, change)
       i = i - 1