You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: jsonfloat.go
    path of file: ./repos/tegola/vendor/google.golang.org/api/internal/gensupport
    
    the code of the file until where you have to start completion: // Copyright 2016 Google LLC.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package gensupport

impor
    
func (f *JSONFloat64) UnmarshalJSON(data []byte) error {
	var ff float64
	if err := json.Unmarshal(data, &ff); err == nil {
		*f = JSONFloat64(ff)
		return nil
	}
	var s string
	if err := json.Unmarshal(data, &s); err == nil {
		switch s {
		case "NaN":
			ff = math.NaN()
		case "Infinity":
			ff = math.Inf(1)
		case "-Infinity":
			ff = math.Inf(-1)
		default:
			return fmt.Errorf("google.golang.org/api/internal: bad float string %q", s)
		}
		*f = JSONFloat64(ff)
		return nil
	}
	return errors.New("google.golang.org/api/internal: data not float or string")
}