func SingleTagBuffer(key string, value interface{}) *Buffer {
	b := &Buffer{}
	b.init(1, 1)
	b.tags[0] = Tag{key: key, value: value}
	return b
}
SingleTagBuffer returns a Buffer with a single tag.
package logtags
import (
	"fmt"
	"strings"
)
const staticSlots = 4
type Buffer struct {
	tags     []Tag
	prealloc [staticSlots]Tag
}