§ 58. Consent of purchaser or assignee of debt. Where a consenting creditor is the purchaser or assignee of a debt against the petitioner, or the executor, administrator, trustee, or receiver of such a purchaser or assignee, he is deemed, for all the purposes of this article, except as to the declaration and receipt of dividends, a creditor only to the amount, actually and in good faith paid for the debt, by him, or by the decedent or other person, from whom he derives title, and remaining uncollected. This section is not affected by the recovery of a judgment for the debt, after the purchase or assignment; but in that case, the consenting creditor may include the uncollected costs, as if they were part of the sum paid for the debt.