`{a,}{a,}a` doesn't match `a`

[KamilaBorowska]

The following program prints false:

package main

import (
    "fmt"
    "github.com/gobwas/glob"
)

func main() {
    g, err := glob.Compile("{a,}{a,}a")
    if err != nil {
        panic(err)
    }
    fmt.Println(g.Match("a"))
}