<?php

function applyDocumentCasts($keyPattern, Closure $closure)
{
        $casts = [
            'unchanged' => fn ($item) => $item,
            'object' => fn ($item) => (object) $item,
            // 'Serializable' => fn ($item) => new BSONDocument($item),
            // 'Document' => fn ($item) => Document::fromPHP($item),
        ];
        
        return array_combine(
            array_map(fn ($castName) => sprintf($keyPattern, $castName), array_keys($casts)),
            array_map(fn ($cast) => $closure($cast), $casts),
        );
}

function provideFilterDocuments(): array
{
    $expectedQuery = (object) ['x' => 1];
    
    return applyDocumentCasts(
        '%s',
        fn ($cast) => [$cast(['x' => 1]), $expectedQuery]
    );
}

var_dump(provideFilterDocuments());