output is not minimized or normalized

[jandockx]

const intersect = require('glob-intersection')

const violet = '{a/2,a/1}'
const purple = 'a/{1,2}'
const union0 = `{${purple},${violet}}`
console.log(`The intersection ${purple} ∩ ${union0} = ${intersect(purple, union0)} has more 
terms than the first operand, but includes the first operand as term literally. This can only be correct 
if the extra terms are covered by the first term. The extra terms are thus meaningless.`)

gives as output

The intersection a/{1,2} ∩ {a/{1,2},{a/2,a/1}} = {a/{1,2},a/2,a/1} has more 
terms than the first operand, but includes the first operand as term literally. This can only be correct 
if the extra terms are covered by the first term. The extra terms are thus meaningless.

a/2,a/1 should not appear in the output