iter.permutations() generates duplicated combinations

[sunnylcw]

VSL version: 0.1.45
OS: Windows 11 Pro 21H2 22000.318

What did you do?
Generated combinations with iter.permutations()

What did you expect to see?
An array of unique combinations

What did you see instead?
An array with some duplicated combinations

Code to reproduce the issue:

import vsl.iter
combinations := iter.permutations([f64(0), 1, 2], 3)
println('combinations: $combinations\n')

// check for duplicates
mut combination_count := map[string]int{}
for combination in combinations {
	combination_count[combination.str()]++
}
println('duplicates:')
for k, v in combination_count {
	if v > 1 {
		println('$k: $v')
	}
}

[ulises-jeremias]

hey! thank for creating this issue! I'll keep you updated with the status of this issue!