CEL int to float conversion bug

main.go

package main

import (
	"fmt"
	"log"
	"strings"

	"github.com/golang/protobuf/jsonpb"
	structpb "github.com/golang/protobuf/ptypes/struct"
	"github.com/google/cel-go/cel"
	"github.com/google/cel-go/checker/decls"
)

func main() {
	e, err := cel.NewEnv(
		cel.Declarations(
			decls.NewIdent("data", decls.NewObjectType("google.protobuf.Struct"), nil),
		),
	)
	if err != nil {
		log.Fatalf("environment creation error: %s\n", err)
	}

        // This doesn't work with an integer, but it works with a float: data.foo == 5.0
	p, iss := e.Parse(`data.foo == 5`)
	if iss != nil && iss.Err() != nil {
		log.Fatalln(iss.Err())
	}
	c, iss := e.Check(p)
	if iss != nil && iss.Err() != nil {
		log.Fatalln(iss.Err())
	}

	prg, err := e.Program(c)
	if err != nil {
		log.Fatalf("program creation error: %s\n", err)
	}

	data := structpb.Struct{}
	if err := jsonpb.Unmarshal(strings.NewReader(`{"foo":5}`), &data); err != nil {
		log.Fatalf("json parse error: %s\n", err)
	}

	out, _, err := prg.Eval(map[string]interface{}{
		"data": &data,
	})
	if err != nil {
		log.Fatalf("runtime error: %s\n", err)
	}

	fmt.Printf("out: %#v\n", out)
}