To copy select box "placeholder" attribute value into chosen "data-placeholder"

[vkelman]

This is not a bug, but rather a suggestion.

It would be nice if chosen had a configuration option to use plain select box' "placeholder" attribute value instead of "data-placeholder". Optionally using plane "placeholder" would simplify switching back and forth between plain select boxes and chosen boxes. I know it's easy to use jQuery to copy "placeholder" attribute value into "data-placeholder" attribute value, but it's still an additional hassle.