Fun with new Ceylon M5 syntax

As a new dev version of the Ceylon Eclipse IDE was pushed, let's play with the syntax 

[String,Number,Boolean,String] fooBarTuple = ["foo",1,true,"bar"];
// can be seen as a sequence with this syntax
[Number|String|Boolean...] fooBarSequence = fooBarTuple;
// or this alternate sequencer
[] fooBarSequenceAlternate = fooBarTuple;
// can be seen as an iterable
{Number|String|Boolean...} fooBarIterable = fooBarSequence;
// create a new tuple with the first tuple    [Number,String,Number,Boolean,String] fooBarTuple42 = [42,fooBarTuple...];
// or a new iterable
{Number|String|Boolean...} fooBarIterable42 = {42,fooBarTuple42...};
// This is too verbose : define an alias
interface MyHeterogenousType => [Number|String|Boolean...];
MyHeterogenousType seenAsMyType = fooBarSequence;
// or use type inferencecompute
value fooBarTupleValue = fooBarTuple;
Boolean vrai = fooBarTupleValue[2];