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Compilation of developer notes on changes in 1.6.
JDatabase::setQuery casts the sql variable to a string. This allows you to pass an object that implements the __toString magic method.
JModel::getState will now take an optional second argument to set the default. $value = $model->getState( 'foo', 'bar' );
Both JFile::write and JFTP::write now use a reference for its second argument. Code like JFile::write($filename,'string'); will fail, however $data = 'string'; JFile::write($filename, $data); will work for both 1.5 and 1.6