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feature#4241 [Form] Added information about float choice lists (peterrehm)

This PR was submitted for the 2.5 branch but it was merged into the 2.3 branch instead (closes#4241).Discussion----------[Form] Added information about float choice lists| Q | A| ------------- | ---| Doc fix? | no| New docs? | no| Applies to | all| Fixed tickets | -Added an information about the possibility to have a choice list with float values.Relates tosymfony/symfony#11849Commits-------81e3728 Added information about float choice lists

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reference/forms/types
- choice.rst

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`‎reference/forms/types/choice.rst`

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`@@ -93,6 +93,14 @@ is the item value and the array value is the item's label::`
`93`	`93`	`'choices' => array('m' => 'Male', 'f' => 'Female')`
`94`	`94`	`));`
`95`	`95`
	`96`	`+..tip::`
	`97`	`+`
	`98`	`+ When the values to choose from are not integers or strings (but e.g. floats`
	`99`	+ or booleans), you should use the `choice_list`_ option instead. With this
	`100`	`+ option you are able to keep the original data format which is important`
	`101`	`+ to ensure that the user input is validated properly and useless database`
	`102`	`+ updates caused by a data type mismatch are avoided.`
	`103`	`+`
`96`	`104`	`choice_list`
`97`	`105`	`~~~~~~~~~~~`
`98`	`106`
@@ -103,6 +111,17 @@ The ``choice_list`` option must be an instance of the ``ChoiceListInterface``.
`103`	`111`	`For more advanced cases, a custom class that implements the interface`
`104`	`112`	`can be created to supply the choices.`
`105`	`113`
	`114`	`+With this option you can also allow float values to be selected as data.`
	`115`	`+`
	`116`	`+..code-block::php`
	`117`	`+`
	`118`	`+ use Symfony\Component\Form\Extension\Core\ChoiceList\ChoiceList;`
	`119`	`+`
	`120`	`+ // ...`
	`121`	`+ $builder->add('status', 'choice', array(`
	`122`	`+ 'choice_list' => new ChoiceList(array(1, 0.5), array('Full', 'Half')`
	`123`	`+ ));`
	`124`	`+`
`106`	`125`	`..include::/reference/forms/types/options/empty_value.rst.inc`
`107`	`126`
`108`	`127`	`..include::/reference/forms/types/options/expanded.rst.inc`

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Commitc2342a7

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`‎reference/forms/types/choice.rst`

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