Version

3.2.20

Reproduction link

codesandbox.io

Steps to reproduce

• App.vue call 2 custom elements, The first directly, and the 2nd after onMounted lifecycle.
• Open codesandbox console.log : the first-one is correct, externalid attribute is number but the 2nd is string

What is expected?

console.log(props) : externalid is number {booleanAttr: true, language: "de", externalid: 4339870}

What is actually happening?

console.log(props) : externalid is string {booleanAttr: true, language: "de", externalid: "4339870"}