func MapSortedKeys(m reflect.Value) []reflect.Value {
	ks := m.MapKeys()
	sort.Sort(SortableValues(ks))
	return ks
}
MapSortedKeys returns a slice of all sorted keys of map "m". It
panics if "m"'s reflect.Kind is not reflect.Map.
package tdutil
import (
	"reflect"
	"sort"
)