Float conversion behavior issue

[naueramant]

Since i upgraded the package to 0.3.0 from 0.1.1 i have noticed that the behavior of the float conversion have changed. An example:

package main

import (
	"fmt"
	"github.com/stretchr/objx"
)

func main() {
	m1 := objx.MustFromJSON(`{"foo": 1500.0}`)
	foo1 := m1.Get("foo").Float64(-1)
	fmt.Println(foo1)
	
	m2 := objx.MustFromJSON(`{"foo": 1500.1}`)
	foo2 := m2.Get("foo").Float64(-1)
	fmt.Println(foo2)
}

Output:

-1
1500.1

Go playground: https://play.golang.org/p/BU-r9HkEZHE

Expected behavior should be that also 1500.0 even 1500 should be seen as a float and therefor not return the default value. One would expect that only non numerical values would return -1 in this example.

[valerius21]

I am having the same issue with Float32