Key points in here: - Thinking differently about Values vs. References (which you may or may not be used to depending on your language) - Mutable "values" are

Key points in here: - Thinking differently about Values vs. References (which you may or may not be used to depending on your language) - Mutable "values" are dangerous (and it might be worth thinking about what constitutes a "value") - Translating incoming low-level numbers and strings into proper "values" helps avoid errors.