* Added **dsinit!** symbol.
* Added **sealed?** and **sealed-sigil?** symbols.
+ **floor** and **ceil** now correctly return an integer again.
* Added **abs** symbol.
* Now executing min shell if no file is specified (unless input is piped in), without the need of specifying **-i**.
* Implemented the possibility to define type classes.
* Added **stringlike?** symbol.