v4.3.3

Programs the compiler accepted and then compiled wrong now compile right,
or are refused where they are written; and the build reads back the
JavaScript it wrote, so a script the browser would refuse never ships.

Fixed

• A number field binds a number. Input(bind: qty).number stored the
  text the field held, so qty + 1 was "31"; it now holds a number, and
  null when it is emptied. A Select binds the option's value: as it
  was written: Select.Option("Two", value: 2) binds 2, not "2".
• A button in a form submits it only when it says so. Every Button
  and IconButton without type: .submit (or .submit) is
  type="button", on the live page and in the static paint; "Add a row"
  in a form used to send the form.
• bind: on a loop item's field writes back. for t in todos by t.id { Input(bind: t.title) } only showed the value; it now writes the item and
  tells the list, so whatever reads todos follows. In a loop with no
  by, the list hears of it when the field is left, so the row is not
  redrawn under the cursor.
• Every control binds a store's member. Switch, Checkbox, Radio,
  Slider and DatePicker bound only a page's state; Switch(bind: Prefs.dark) drew no input at all.
• A state, derived or prop that holds a function is called.
  derived scale = (x) => x * factor then scale(3) compiled to a call
  of nothing; assigning a function to a state stored what the function
  returned. WF.signal(…).set(fn) now stores fn; .update(fn) is the
  updater it always was.
• A store action's let and if let. A let reassigned later in the
  action compiled to a const; an if let inside an action bound nothing.
• A name declared twice is an error where it is written. Two stores,
  two constants, a store and a constant, a state and a derived, a store's
  state and its action, a prop and a state, a page's parameter and a state:
  each compiled to a script the browser refused, or let the second quietly
  replace the first. A component may still share its name with a type.
• The build reads back what it wrote. Every compiled script is checked
  before and after minifying — strings, templates, regular expressions and
  comments closed, brackets matched, no name declared twice in one block —
  and a fault stops the build as the compiler's bug, with the line it
  wrote.
• wf test: type "Two" into "Size" on a select threw; it now picks
  the option by its text, or its value.

Changed

• A button inside a form that submitted it without saying so no longer
  does: give it type: .submit.
• A program with a name declared twice no longer builds. Most such
  programs already failed in the browser.

Full Changelog: v4.3.2...v4.3.3