Bool values print as 0/1 instead of true/false

[mjm918]

Description

When printing bool values with println or print, they render as 0 and 1 instead of true and false.

Steps to Reproduce

fn main() {
    println("result: {}", true);
    println("result: {}", false);
}

Expected:

result: true
result: false

Actual:

result: 1
result: 0

Impact

Affects any program that prints boolean values, including the linkedlist and binary_tree examples where contains/search functions return bool.