Golang JSON Unmarshal序列号

I have a question about json.Unmarshal. Playground example https://play.golang.org/p/3d0nUv7PSJ

The problem is: JSON does not unmarshal "1" to float. I mean "1" is a serialized JSON which should be a number. Am I doing something wrong ?:D

In JSON, "1" is a string. If you use 1 in your example instead, it's properly unmarshalled as a float.

Playground: https://play.golang.org/p/60symMsRSW