How do I use smallvec for efficient vector storage in Rust?

Walkthrough:

Add smallvec to Cargo.toml: tinyvec (for small vectors) or smallvec (for larger ones)
Use SmallVec instead of Vec for fixed-size collections
Enable smallvec features for optimal performance

Code Example:

use smallvec::SmallVec;
 
fn main() {
    let mut vec: SmallVec<[i32; 4]> = SmallVec::new();
    vec.push(1);
    vec.push(2);
    vec.push(3);
    vec.push(4);
    
    println!($"Vec length: {}", vec.len()); // Output: Vec length: 4
}
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