Data Attributes dash vs underscore modifications

[dancrew32]

I'm in the process of converting some interpolated data attributes to use bindonce's bo-attr-data* and noticed something unexpected:

var bar = {
  foo_thing: 'testing1',
  foo_other: 'testing2'
};

Say there are data attributes written with underscores, which (I believe) is valid HTML:

<ANY data-foo_thing="{{ bar.foo_thing }}" data-foo_other="{{ bar.foo_other }}"></ANY>

So in the directive you can go:

return function($scope, $element, $attrs) {
    var element_data = $element.data(); // gather all data attributes in one pass
    console.log(element_data.foo_thing); // 'testing1'
    console.log(element_data.foo_other); // 'testing2'
};

When converting code like this to use bindonce's bo-attr, it is replacing underscores with dashes.
Think it might be this line: https://github.com/Pasvaz/bindonce/blob/master/bindonce.js#L198

<ANY bo-attr bo-attr-data-foo_thing="bar.thing" bo-attr-data-foo_other="bar.other"></ANY>

becomes

<ANY bo-attr bo-attr-data-foo_thing="bar.foo_thing" bo-attr-data-foo_other="bar.foo_other"
data-foo-thing="testing1" data-foo-other="testing2"></ANY>

which results in:

return function($scope, $element, $attrs) {
    var element_data = $element.data(); // gather all data attributes in one pass
    console.log(element_data.foo_thing); // undefined
    console.log(element_data.foo_other); // undefined

   // actual data, camelCased
   console.log(element_data.fooThing); // testing1
   console.log(element_data.fooOther); // testing2
};

It would be nice if the format of the data attributes were preserved.