TODO: Behaviour is not the same like it is in other New* functions, missing parent.

Float and Number can be merged, only Type is different.

TODO: This does not work as it should, that variable assignment is done just by a simple string, I do not care if these values are used later on.

Block is the second most common type found in the AST.

Expression the the most common type here.

Node represents the most simple thing which can appear in the AST.