This method accepts a variable number of arguments. If the table has a
multi-column primary key, the number of arguments must be the same as
the number of columns in the primary key. To find multiple rows in a
table with a multi-column primary key, each argument must be an array
with the same number of elements.
The find() method always returns a array
Row by primary key, return array
Table::find(123);
Row by compound primary key, return array
Table::find([123, 'abc']);
Multiple rows by primary key
Table::find(123, 234, 345);
Multiple rows by compound primary key
Table::find([123, 'abc'], [234, 'def'], [345, 'ghi'])