'Bootstrap vue input type="number"

When creating type="number" input, it getting '+' or '-' characters. I want to prevent it. However when I tried to watch every state changed on input value, it does not show '+' or '-' characters.

input:

  <b-form-input   
      v-model="port"
      type="number"             
     >

and watch:

watch: {
    port(val){
      console.log("val ", val)
    }
  },

For example when I write '564+-' to the input then the watch just can follow '564'. How can prevent minus and plus characters?

vue.jsvuejs2bootstrap-vue


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