Fix typeof array condition

[star-diopside]

I see rails/jquery-ujs PR rails#395, but it don't work normally by array params.

<a href="xxx" data-method="post" data-params="{key:['val1','val2']}">xxx</a>

I expect the following movement rails controller params.

{ "key" => ["val1", "val2"] }

However, I really work as follows.

{ "key" => { "0" => "val1", "1" => "val2" } }

Is this movement not a problem? Javascript typeof don't match 'array', should I use 'jQuery.isArray'

[KODerFunk]

I dive in this after 25 feb.