wu instances are consumible iterables.

[xgbuils]

Hi!

I realized that wu instances can be used only once:

var x = wu([1, 2, 3]).map(e => 2 * e)
console.log([...x]) // [2, 4, 6]
console.log([...x]) // []

This problem could difficult debugging code but it also don't allow to use intermediate variables like:

var intermediate = wu([1, 2, 3]).map(e => 2 * e)
var x = intermediate.map(e => 3 * e)
var y = intermediate.map(e => e + 1)
console.log(x.toArray()) // [6, 12, 18]
console.log(y.toArray()) // []

Cheers!