There's a discrepancy in config between our staging and prod Lucee, so

<cfscript>
    local.array = [1,2,3]
    local.array.each((struct item, numeric rowNumber) => {
		dump(arguments.item);		
	});
</cfscript>

This errors with

Invalid call of the function [lambda_7o0h], first Argument [item] is of invalid type, Cannot cast Object type [Number] to a value of type [struct]

as expected but no error on our staging env. Anyone know what config controls this?

Might be a good question for the Lucee channel. There's a setting in CF to disable type-checking? Presume Lucee has same?

Thanks Adam, will have a look

could be possibly related cached classes, you try running https://docs.lucee.org/reference/functions/pagepoolclear.html once from within your application. mentioning which lucee versions you are using always helps provide more context to problems