wp_editor() does not work when textarea name uses brackets

[veganist]

This is related to #27601.

Since 3.9 it's not possible anymore to use wp_editor on a textarea with brackets in the name.

<textarea name="foo[bar]"></textarea>

However, using brackets in the name is perfectly valid afaik, and helps to add the texteditor's content to a set of variables, sent with a form.

So, simply telling the user that this does not work does not seem to be a valid fix to me.

Am i missing something? Is there a known workaround which does not require modifying the whole database of already saved meta data?

[SergeyBiryukov]

Related: comment:28:ticket:26778

[SergeyBiryukov]

Duplicate of #28079.