better extmark inclusivity

examples/form.lua

@@ -10,9 +10,6 @@ local Renderer = require('u.renderer').Renderer
 local h = require('u.renderer').h
 local tracker = require 'u.tracker'
 
--- Utility to trim brackets from strings:
-local function trimb(s) return (s:gsub('^%[(.*)%]$', '%1')) end
-
 -- Create a new, temporary, buffer to the side:
 vim.cmd.vnew()
 vim.bo.buftype = 'nofile'
@@ -21,13 +18,13 @@ vim.bo.buflisted = false
 local renderer = Renderer.new()
 
 -- Create two signals:
-local s_name = tracker.create_signal '[whoever-you-are]'
-local s_age = tracker.create_signal '[ideally-a-number]'
+local s_name = tracker.create_signal 'whoever-you-are'
+local s_age = tracker.create_signal 'ideally-a-number'
 
 -- We can create derived information from the signals above. Say we want to do
 -- some validation on the input for `age`: we can do that with a memo:
 local s_age_info = tracker.create_memo(function()
-  local age_raw = trimb(s_age:get())
+  local age_raw = s_age:get()
   local age_digits = age_raw:match '^%s*(%d+)%s*$'
   local age_n = age_digits and tonumber(age_digits) or nil
   return {
@@ -59,9 +56,8 @@ tracker.create_effect(function()
         on_change = function(text) s_name:set(text) end,
       }, name),
     },
-    '\n',
     {
-      'Age: ',
+      '\nAge: ',
       h.Structure({
         on_change = function(text) s_age:set(text) end,
       }, age),
@@ -72,7 +68,7 @@ tracker.create_effect(function()
     -- Show the values of the signals here, too, so that we can see the
     -- reactivity in action. If you change the values in the tags above, you
     -- can see the changes reflected here immediately.
-    { 'Hello, "', trimb(name), '"!' },
+    { 'Hello, "', name, '"!' },
 
     --
     -- A more complex example: we can do much more complex rendering, based on