easyjson doesn't respect TextUnmarshaler

[i]

https://golang.org/src/encoding/encoding.go?s=1851:1919#L36

For example, the following code will not work as expected with easyjson:

package main

import (
    "encoding/json"
    "fmt"
)

type Number int64

func (n *Number) UnmarshalText(text []byte) error {
    switch string(text) {
    case "ONE":
        *n = 1
    case "TWO":
        *n = 2
    default:
        *n = -1
    }
    return nil
}

type S struct {
    Index Number
}

func main() {
    var s S
    json.Unmarshal([]byte(`{"index": "ONE"}`), &s)
    fmt.Println(s)
}