Trouble mutating a `SyntaxCollection`

[NSExceptional (Tanner Bennett)]

I'm trying to update and replace a specific MemberBlockItemSyntax within a MemberBlockItemListSyntax. This is proving difficult, as some APIs expect Int indexes, and others vend custom index types that don't expose raw integer indexes.

Does anyone have any guidance?

[ahoppen (Alex Hoppen)]

Can you do the following?

modifiedNodes.memberBlock.members[affectedIndex] = newValue