Vue.js 3 (Vite)で複数のinput boxから入力を受けたいがUncaught TypeError: _ctx.value is undefinedになる

Question

Vue.jsに入門しています。公式のハローワールドをいじって複数のinput boxから入力を受けようとしています。しかしながら次のようなエラーが出て画面にinputが表示されません。

https://github.com/yumetodo/rftools-coodinate-calculator/tree/feat/impl_ui

[vite] connecting... client.ts:13:8
[vite] connected. client.ts:43:14
[Vue warn]: Property "onInput" was accessed during render but is not defined on instance. 
  at <HelloWorld msg="Hello Vue 3 + Vite" > 
  at <App> runtime-core.esm-bundler.js:38:16
[Vue warn]: Unhandled error during execution of render function 
  at <Inputs onInput=undefined > 
  at <HelloWorld msg="Hello Vue 3 + Vite" > 
  at <App> runtime-core.esm-bundler.js:38:16
Uncaught TypeError: _ctx.value is undefined
    _sfc_render Inputs.vue:5
    renderComponentRoot runtime-core.esm-bundler.js:1165
    componentEffect runtime-core.esm-bundler.js:5184
    reactiveEffect reactivity.esm-bundler.js:42
    effect reactivity.esm-bundler.js:17
    setupRenderEffect runtime-core.esm-bundler.js:5137
    mountComponent runtime-core.esm-bundler.js:5096
    processComponent runtime-core.esm-bundler.js:5054
    patch runtime-core.esm-bundler.js:4660
    mountChildren runtime-core.esm-bundler.js:4844
    processFragment runtime-core.esm-bundler.js:5013
    patch runtime-core.esm-bundler.js:4653
    componentEffect runtime-core.esm-bundler.js:5191
    reactiveEffect reactivity.esm-bundler.js:42
    effect reactivity.esm-bundler.js:17
    setupRenderEffect runtime-core.esm-bundler.js:5137
    mountComponent runtime-core.esm-bundler.js:5096
    processComponent runtime-core.esm-bundler.js:5054
    patch runtime-core.esm-bundler.js:4660
    mountChildren runtime-core.esm-bundler.js:4844
    processFragment runtime-core.esm-bundler.js:5013
    patch runtime-core.esm-bundler.js:4653
    componentEffect runtime-core.esm-bundler.js:5191
    reactiveEffect reactivity.esm-bundler.js:42
    effect reactivity.esm-bundler.js:17
    setupRenderEffect runtime-core.esm-bundler.js:5137
    mountComponent runtime-core.esm-bundler.js:5096
    processComponent runtime-core.esm-bundler.js:5054
    patch runtime-core.esm-bundler.js:4660
    render2 runtime-core.esm-bundler.js:5774
    mount runtime-core.esm-bundler.js:4070
    mount runtime-dom.esm-bundler.js:1288
    <anonymous> main.ts:4
Inputs.vue:5:54

/src/components/Inputs.vue#L5

 <input type="number" :value="value.builder[0]" @input="updateValue('builder', 0, $event.target.value)" />

参考にしたサイト

• Vue.jsでForm要素のラッパーコンポーネントを作る際の2つの方法（v-bind.sync, v-model） - Qiita
• Vue.js：v-modelと$emitを使ってデータを読み書きする子コンポーネントをつくる (2019/10/13追記) - Qiita
• propsと$emitでデータを引き渡す - Qiita