Community lambdas.

Copyable definitions. Tested. Tagged. Star the ones you use.

Name	Signature	Description	Tags	★
IRR.BISECT	(cashflows, [guess])	Internal rate of return via bisection — more stable than the native IRR for irregular flows.	finance, stats	298
GEO.HAVERSINE	(lat1, lon1, lat2, lon2)	Great-circle distance in km between two lat/lon pairs.	geo, finance	174