custom_field options weighting breaks array keying

The current implementation of custom_field_create attempts to order option_values by weight when creating a new custom_field. However, it does this destructively and if multiple options have the same weight, the result is significant data loss.

e.g. the foreach loop responsible can be found on line 91-95 of api/v3/CustomField.php. If the following data is passed into the loop:

array(
0 => array(
'name' => 'Option 1'
'weight' => 0
...
),

1 => array(
'name' => 'Option 2'
'weight' => 0
...
),

2 => array(
'name' => 'Option 3'
'weight' => 0
...
)
)

The following item is returned:

array(
0 => array(
'name' => 'Option 3'
'weight' => 0
...
)
)

Resulting in the loss of two items.

Given that the API permits the creation of non-weighted option_values, this foreach should be removed. The weighted order of option_values should then be weighting determined on retrieval (non destructive) rather than on create (resulting in data loss).