Is there a way to sort users by their first or last names instead of their user Ids?

This will solve the problem, but it doesn't scale too well for sorting large numbers of users (>150).

=a!localVariables(
  local!datasubset: todatasubset(
    arrayToPage: a!forEach(
      items: ri!users,
      expression: {
        username: tostring(fv!item),
        firstName: if(ri!sortBy = "firstName",user(fv!item,"firstName"),""),
        lastName: if(ri!sortBy = "lastName",user(fv!item,"lastName"),"")
      }
    ),
    pagingConfiguration: a!pagingInfo(
      startIndex: 1,
      batchSize: -1,
      sort: a!sortInfo(
        field: ri!sortBy,
        ascending: ri!ascending
      )
    )
  ),
  touser(index(local!datasubset.data,"username"))
)

This will solve the problem, but it doesn't scale too well for sorting large numbers of users (>150).

=a!localVariables(
  local!datasubset: todatasubset(
    arrayToPage: a!forEach(
      items: ri!users,
      expression: {
        username: tostring(fv!item),
        firstName: if(ri!sortBy = "firstName",user(fv!item,"firstName"),""),
        lastName: if(ri!sortBy = "lastName",user(fv!item,"lastName"),"")
      }
    ),
    pagingConfiguration: a!pagingInfo(
      startIndex: 1,
      batchSize: -1,
      sort: a!sortInfo(
        field: ri!sortBy,
        ascending: ri!ascending
      )
    )
  ),
  touser(index(local!datasubset.data,"username"))
)