1. Most Lisp dialects, including Scheme and ANSI Lisp, have interactive modes for evaluating expressions.
2. Most Lisp dialects have a mode of processing files in the same manner: reading individual forms and evaluating them immediately. I.e. it is not necessary to translate files into objects that have to be linked to produce an executable program.
This is only true for values calculated at compile time. Once the result is stored in a variable it is converted to a fixed-size representation. All runtime calculations and results are fixed size.
https://golang.org/ref/spec#Constants