While most usage of Templater involves table with predefined columns, so that only rows are created, sometimes for unknown number of columns, it's useful to expand table both horizontally and vertically.
While styling will be more limited in that case, table style will still be respected.
Dynamic resize works on low level API by detecting special data type: String[][] and first resizing table to appropriate size and then populating cell contents with provided data.
Streams can be used for input/output.
Output stream will be populated on ITemplaterDocument.flush() method.
Dynamic resize support few special keywords. merge-nulls is one of those. It can be used for merging cells which contain null values.