Read the following passage from an essay on legal history:
In eighteenth-century English contract law, promises within bilateral agreements were traditionally presumed to be independent covenants, meaning that one party's failure to perform did not excuse the other party's obligation, but merely gave rise to an action for damages. In Boone v. Eyre (1777), Lord Mansfield modified this rigid construct by establishing that where a breach goes only to part of the consideration and can be compensated in damages, the covenants remain independent, whereas if the breach goes to the entire root of the contract, the defendant's obligation is excused. Mansfield illustrated this distinction by positing a vendor who conveys a plantation with a title defect concerning only a single laborer among many: to permit the purchaser to retain the estate without paying the purchase price would generate an unjust forfeiture grossly disproportionate to the vendor's default. Modern formalists often cite Mansfield’s plantation hypothetical as an unprincipled equitable deviation from strict contractual autonomy; however, its primary analytical role was to formalize a constructive doctrine of substantial performance that reconciled commercial stability with the prevention of opportunistic evasion.
Statement: In the context of the passage, the reference to 'a single laborer among many' functions primarily to provide historical evidence documenting the prevalence of title disputes in eighteenth-century colonial transactions.
Answer: Answer