[Config] Provide shorthand methods for ArrayNodeDefinition::prototype()

[skafandri]

Q	A
Bug report?	no
Feature request?	yes
BC Break report?	no
RFC?	yes
Symfony version	master

ArrayNodeDefinition::prototype() returns a NodeDefinition. However in reality it returns an IntegerNodeDefinition, ArrayNodeDefinition and so on.

This makes the last line of the following code ->max(10) not recognizable by IDEs and with a bit TreeBuilder is can become annoying

$node = new ArrayNodeDefinition('name');
$node
    ->prototype('integer')
    ->max(10);

I propose to provide shorthand methods for the standard node types (variable, scalar, boolean, integer, float, array, enum)

So the previous snippet could be written as

$node = new ArrayNodeDefinition('name');
$node
    ->prototypeInteger()
    ->max(10);

As a result, your IDE will recognize that it returns NumericNodeDefinition and can follow the call.

[arnaspet]

I think it's too much verbosity. 100 lines of code only for ide support is too much.
also i guess if you really want ide supportm you could do phpDoc like this

    /**
     * Sets a prototype for child nodes.
     *
     * @param string $type the type of node
     *
     * @return IntergerDefinition|ArrayDefinition| ScalarNodeDefinition // you get the point
     */
    public function prototype($type)
    {
...

but again, you would need to support those comments, if any NodeDefinition class would be created, you would forget to update this comment