Casting from float or int to string will convert the given number into a decimal ascii string representation.

Casting from string to float or int will do the opposite. IE. Read a decimal number from the string and return that.

Casting from string to program will call cast_to_program in the master object and request a program to return. The standard master object will consider the string a file name and compile the program given by that string. It will then put the program in a chache in case you cast the same string to a program again later.

Castring from string to object will call cast_to_object in the master object and request an object to return. The standard master object will consider the string a file name, cast it to a program and return a clone of that file. If the same cast is attempted again later, the _same_ object will be returned.

When casting an object, the method o->cast will be called with a string with the name of the type as argument. o->cast can then return any value.

In all other cases, casts are just compiler hints.