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/**
 * Token counts from the server's own tokenizer: the only accurate figure a
 * PHP client can get, and what ContextBudget calibrates against.
 *
 * @var array{prompt: int, completion: int}|null
 */
private ?array $lastUsage {
    get => $this->lastOf('usage');
    set(?array $value) {
        $this->keepLast('usage', $value);
    }
}