intsets

nimony/lib/std/intsets.nim

```
type IntSet = object
  t: Table
```
func initIntSet(): IntSet
func incl(s: var IntSet; x: int64)
func excl(s: var IntSet; x: int64)
func contains(s: IntSet; x: int64): bool
func containsOrIncl(s: var IntSet; x: int64): bool
func len(s: IntSet): int64
The number of elements in s.
func ==(a: IntSet; b: IntSet): bool
Same elements, however the two sets were built.
func hash(s: IntSet): uint64
Combines the blocks commutatively: the table keeps them in insertion order, and two equal sets need not have inserted them alike.
iterator items(s: IntSet): int64