Int31n was copied from src/math/rand/rand.go to support Shuffle in go versions before 1.10.

Round was copied from src/math/floor.go to support Round in go versions before 1.10.

Shuffle was copied from src/math/rand/rand.go to support Shuffle in go versions before 1.10.

go:generate pie Float64s.*.

go:generate pie Int32s.*.

go:generate pie Int64s.*.

go:generate pie Ints.*.

go:generate pie Strings.*.

go:generate pie Uint32s.*.

go:generate pie Uint64s.*.