TODO list: always incomplete :-)
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- Make forms auto-instanciable.

- Make installation program ?

- Make objects printable, with a "_print" hidden method or something else.

- Preprocessor (#IF, #ELSE, #ENDIF, #DEFINE).

- Enumerations must manage object destructions.

- Make objects writable and readable to streams.

- Perl regexp with the MATCH operator.

- Use pselect() to wait for a process

- Drag & Drop support

- Variable number of arguments
