entity_metadata_wrapper forces me to use language code on translatable fields

Additional information

Updated issue summary.

Updated issue summary.

I'm getting closer to the problem:

This does not work:

$wrapper->field_text_summary->set(array('value' => 'A description'));

This does:

$wrapper->language('de')->field_text_summary->set(array('value' => 'A description'));

// but NOT:
$wrapper->language('und')->field_text_summary->set(array('value' => 'A description'));

Also, when I try to access the fields data, I'm forced to tell the language:

$wrapper->field_text_summary->value(); // empty!
$wrapper->language('de')->field_text_summary->value(); // gives me the value

What's going on here? Do you need more information?

Updated issue summary.

The behavior seems to come from the translatable property of a field. If I set a field to non-translatable it works as intended. On translatable fields you are forced to define a language code to work on.

So I mark this as bug since the language should be LANGUAGE_NONE if not explicitly declared.