In Eisendrath v. Superior Court (2003) 109 Cal.App.4th 351, a former husband moved to correct a spousal support agreement negotiated in mediation. (Id. at p. 355.) . . . He argued many of the conversations that occurred before the agreement was signed would demonstrate it did not accurately reflect the parties' understanding. Eisendrath held the discussions, which purportedly were inconsistent with the finalized mediated agreement, were inadmissible. Eisendrath concluded that . . . mediation confidentiality cannot be impliedly waived. (Eisendrath, supra, at p. 362.)