Dynamic compound tag

You can't assign arbitrary fields to CompoundTag anymore.
Bad:

PHP:

$tag = new CompoundTag();
$tag->SomeTag = new StringTag("SomeTag", "hi");


Good:

PHP:

$tag = new CompoundTag();
$tag->setTag(new StringTag("SomeTag", "hi");


Please note that this is not finalized in a release and may still change. The "legacy/alpha11" branch on github is also updated to 1.2.13 and does not have any breaking changes vs ALPHA11 release (although it does have more bugs).