Add laziness to data evaluation

Requirements

PHP ^8.0

Installation

composer require strictify/lazy

Usage:

use Strictify\Lazy\LazyValue;

function someSlowFunction() {
    sleep(5);
    
    return 42;
}

// assigning the value does nothing
$lazy = new LazyValue(fn() => someSlowFunction());

// waits 5 seconds, returns 42
$lazy->getValue();

// immediately returns 42
$lazy->getValue();

Full static analysis; psalm will always know the correct type.

More real cases soon.