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Outputs a simple `<label>` with a HTML5 `<input type="number">` wrapped in the standard
`<li>` wrapper. This is the default input choice for all database columns of the type `:float`
and `:decimal`, as well as `:integer` columns that aren't used for `belongs_to` associations,
but can be applied to any text-like input with `:as => :number`.

Sensible default values for the `min`, `max` and `step` attributes are found by reflecting on 
the model's validations (when provided). An `IndeterminableMinimumAttributeError` exception 
will be raised when the following conditions are all true:

* you haven't specified a `:min` or `:max` for the input
* the model's database column type is a `:float` or `:decimal`
* the validation uses `:less_than` or `:greater_than`

The solution is to either:

* manually specify the `:min` or `:max` for the input
* change the database column type to an `:integer` (if appropriate)
* change the validations to use `:less_than_or_equal_to` or `:greater_than_or_equal_to`

@example Full form context and output

  <%= semantic_form_for(@user) do |f| %>
    <%= f.inputs do %>
      <%= f.input :shoe_size, :as => :number %>
    <% end %>
  <% end %>

        <li class="numeric">
          <label for="user_shoe_size">Shoe size</label>
          <input type="number" id="user_shoe_size" name="user[shoe_size]">

@example Default HTML5 min/max/step attributes are detected from the numericality validations

  class Person < ActiveRecord::Base
    validates_numericality_of :age, 
      :less_than_or_equal_to => 100, 
      :greater_than_or_equal_to => 18, 
      :only_integer => true

  <%= f.input :age, :as => :number %>

  <li class="numeric">
    <label for="persom_age">Age</label>
    <input type="number" id="person_age" name="person[age]" min="18" max="100" step="1">

@example Pass attributes down to the `<input>` tag with :input_html
 <%= f.input :shoe_size, :as => :number, :input_html => { :min => 3, :max => 15, :step => 1, :class => "special" } %>

@example Min/max/step also work as options
 <%= f.input :shoe_size, :as => :number, :min => 3, :max => 15, :step => 1, :input_html => { :class => "special" } %>

@example Use :in with a Range as a shortcut for :min/:max
 <%= f.input :shoe_size, :as => :number, :in => 3..15, :step => 1 %>
 <%= f.input :shoe_size, :as => :number, :input_html => { :in => 3..15, :step => 1 } %>

@see Formtastic::Helpers::InputsHelper#input InputsHelper#input for full documentation of all possible options.
@see Rails' Numericality validation documentation
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